I want to put ads on all pages except registration and login page (i.e. the page with no content) coz adsense do no allow this.
Now i hv heard that it can be done using phpbb2 templates(by inserting additional codes)

I want ads at top and bottom of all pages and if possible one in middle.
Can anybody help me?

Also please specify the path from where the template code is to be edited

Thanks a ton in advance.

Well you can do this, if you want all ads to be in your forum.

admin panel>general>configuration>"Activate ads=members and anonymous">then save it.

hope this helps you.