Move pages as posts

I decided to transform by clickbank site in a adsense niche site. I had only 1 article as post. The rest of the articles are pages. So, I deleted the article from the main page who was about that clickbank product. I write a new article and posted.

Therefore, now I have an article posted and the rest of the articles as pages. Can I transform/move that page articles in regullar posts ? If yes, how ?

And the second problem is about site aspect. I cannot add widgets on the right sidebar. I had installed 2010 weaver theme but now I'm using twenty ten classic wordpress theme. And I still cannot add a widget to sidebar. this is how it looks: http://i56.tinypic.com/vnm4ja.jpg
what can I do ?

thank you

Why not just leave them as pages and add new content as posts?

You can move the pages to posts but you should 301 redirect the old page to the new post if the URL is different.

So page http://www.xxx.yyy.zzz/page1/ redirect to your post http://www.yyy.zzz/catagory/post1/
(will change depending on what your permalink is).

For a few pages adding the 301 to .htaccess will work (Google to find out how to do it as there are plenty of guides available and it isn't difficult just use care).

As to the Widgits no idea sorry.