Adsense on a Wordpress Blog?

[spongebob]

Good day to all Webproworld members. I have a wordpress hosted (free) blog and I have an account with adsense. I have tried pasting the code in but it never seems to work, however, yesterday I loaded a specific page by doing a search on google that took me into the unique post (slug).

At the top of the post low and behold there was a bunch of google ads. Just what I want but sadly they dissapeared on re-loading, there is no code in the post and they wont come back damn them.

Has any one got an idea how to solve this wordpress issue??

I guess I could copy the blog off onto a paid hosting and gain full control over the body of the HTML for the page but how much does that cost?

I am a keen SEO textual content writer and I will be glad to offer my advice and assistance to any one who wants it, please help me with this blog.