You could use a plugin. you could either count paragraphs, and put it between certain ones, or you could place it manually with some sort of trigger.
This looks like it fits the bill:
http://www.acmetech.com/blog/2005/07/26/adsense-deluxe-wordpress-plugin/
You can also use something like CG-Inbetween to pull in adsense code based upon every Nth post on a page, or a particular one just for single pages. It’s a helper plugin, nothing truly magical if you know some PHP. 😉
I tried the adsense-deluxe plugin but it doesnt work.
i uploaded file to the content folder
activated it
put in my adsense code
put the<!–adsense–> in my post
doesnt show up.
