I just got approved for adsense, but I'm having trouble putting the ads up. First, I'm not entirely sure where I'm supposed to enter the code. Second, when I tried putting it in the 'edit css' box and previewed it, the ad did not show up and the top of the page informed me I needed to pay for an upgrade to save the changes anyway. I definitely don't want to upgrade until I know what I'm doing. Also, how much does this upgrade cost?
The blog I need help with is heyitseliza.wordpress.com.