Adsense block position very hard to insert
 

I see this block in one forum and i world like replace it in my forums.
Any person can help you?

They are using one of the built in vBulletin Ad location templates, just add your google code to the one you want and it displays just like that, check out style manager>edit templates and expand the ad location template so you can see which ones are available. Depend on the style, if you have a custom style, you may have to tweak it to get it to work.