Locking Link with PHP

So I made a referral site and I'm not very good with Php...

So I want a button which is a link to other site so be locked until member gets 10 points or so

This is php condition ( I don't know what to insert here)

<? if($hits > 9){
?>

And this is the button

<button type="button" class="button" onclick="location.href='#';">Click me</button>

Thanks, gonna try it out