How to embed Aweber form inside of a WordPress PHP file?

<script type="text/javascript" src="http://forms.aweber.com/form/27/1472776027.js"></script>

<?php

class NewsletterWidgetCustom extends WP_Widget {
    function NewsletterWidgetCustom(){
        parent::WP_Widget(false, $name = 'Newsletter Custom',
            array('description' => 'Newsletter widget to add subscription forms on sidebars'),
            array('width' => '350px'));
    }
    
    function widget($args, $instance) {
        global $newsletter;
        extract($args);
        
        echo $before_widget;
        
        $options = get_option('newsletter');
        $options_profile = get_option('newsletter_profile');
        
        $form = '<span class="text-new">new</span>';
        
        if (!empty($instance['t1'])){
            $form .= '<strong class="subhead">'.$instance['t1'].'</strong>';
        }
        
        if (!empty($instance['t2'])){
            $form .= '<div class="heading-sidebar">'.
                        '<div class="heading-holder">'.
                            '<h4>'.str_replace(
                                array('[', ']'),
                                array('<span class="mark">', '</span>'),
                                $instance['t2']).
                            '</h4>'.
                        '</div>'.
                     '</div>';
        }
        
        if (!empty($instance['text'])){
            $form .= wpautop(str_replace(
                                array('[', ']'),
                                array('<strong>', '</strong>'),
                                $instance['text'])
                            );
        }
        
        
        $form .= '<div class="newsletter newsletter-widget">'.
                    '<form action="'.$newsletter->options_main['url'].'" onsubmit="return newsletter_check(this)" '.
                        'method="post" class="report-form"><fieldset>'.
                    
                    '<input type="hidden" name="na" value="s"/>'.
                    '<input type="hidden" name="nr" value="widget"/>';
        
        if ($options_profile['name_status'] == 2){
            $form .= '<div class="row">'.
                        '<label for="name">Name</label>'.
                        '<span class="text"><input type="text" id="name" name="nn" value="'.$options_profile['name'].'"/></span>'.
                     '</div>';
        }
        
        if ($options_profile['surname_status'] == 2){
            $form .= '<div class="row">'.
                        '<label for="surname">Sname</label>'.
                        '<span class="text"><input type="text" id="surname" name="ns" value="'.$options_profile['surname'].'"/></span>'.
                     '</div>';
        }
        
        $form .= '<div class="row">'.
                    '<label for="email1">Email</label>'.
                    '<span class="text"><input type="text" id="email1" name="ne" value="'.$options_profile['email'].'"/></span>'.
                 '</div>';
        
        if ($options_profile['sex_status'] == 2){
            $form .= '<div class="row">'.
                        '<select name="nx" class="newsletter-sex">'.
                            '<option value="m">'.$options_profile['sex_male'].'</option>'.
                            '<option value="f">'.$options_profile['sex_female'].'</option>'.
                        '</select>'.
                     '</div>';
        }
        
        if ($options_profile['privacy_status'] == 1){
            $form .= '<div class="row"><input type="checkbox" name="ny"/> '.$options_profile['privacy'].'</div>';
        }
        
        $form .= '<input type="submit" class="submit" value="'.$options_profile['subscribe'].'"/>';
        
        if (!empty($instance['ts'])){
            $form .= '<span class="info-text">'.$instance['ts'].'</span>';
        }
        
        $form .= '</fieldset></form></div>';
        
        if (!empty($instance['t3'])){
            $form .= '<strong class="subtext">'.$instance['t3'].'</strong>';
        }
        
        echo $form, $after_widget;
    }
    
    function update($new_instance, $old_instance) {
        $instance = $old_instance;
        $instance['t1'] = strip_tags($new_instance['t1']);
        $instance['t2'] = strip_tags($new_instance['t2']);
        $instance['text'] = strip_tags($new_instance['text']);
        $instance['ts'] = strip_tags($new_instance['ts']);
        $instance['t3'] = strip_tags($new_instance['t3']);
        return $instance;
    }
    
    function form($instance){
        
        ?><p><?php
            ?><label for="<?php echo $this->get_field_id('t1');?>"><?php
                ?>Title 1:<?php
                ?><input class="widefat" id="<?php echo $this->get_field_id('t1');?>" name="<?php
                    echo $this->get_field_name('t1');?>" type="text" value="<?php echo esc_attr($instance['t1']);?>"/><?php
            ?></label><?php
        ?></p><?php
        ?><p><?php
            ?><label for="<?php echo $this->get_field_id('t2');?>"><?php
                ?>Title 2:<?php
                ?><input class="widefat" id="<?php echo $this->get_field_id('t2');?>" name="<?php
                    echo $this->get_field_name('t2');?>" type="text" value="<?php echo esc_attr($instance['t2']);?>"/><?php
            ?></label><?php
        ?></p><?php
        ?><p><?php
            ?><label for="<?php echo $this->get_field_id('text');?>"><?php
                ?>Text:<?php
                ?><textarea class="widefat" rows="10" cols="20" id="<?php echo $this->get_field_id('text');?>" name="<?php
                    echo $this->get_field_name('text');?>"><?php echo esc_html($instance['text']);?></textarea><?php
            ?></label><?php
        ?></p><?php
        ?><p><?php
            ?><label for="<?php echo $this->get_field_id('ts');?>"><?php
                ?>Title Under "Submit":<?php
                ?><input class="widefat" id="<?php echo $this->get_field_id('ts');?>" name="<?php
                    echo $this->get_field_name('ts');?>" type="text" value="<?php echo esc_attr($instance['ts']);?>"/><?php
            ?></label><?php
        ?></p><?php
        ?><p><?php
            ?><label for="<?php echo $this->get_field_id('t3');?>"><?php
                ?>Title 3:<?php
                ?><input class="widefat" id="<?php echo $this->get_field_id('t3');?>" name="<?php
                    echo $this->get_field_name('t3');?>" type="text" value="<?php echo esc_attr($instance['t3']);?>"/><?php
            ?></label><?php
        ?></p><?php
        
    }
}

add_action('widgets_init', create_function(EMPTY_STRING, 'return register_widget("NewsletterWidgetCustom");'));