How can I add advertisement in discussions?

Yo

How can I add advertisement in the box of discussions? Where is the code of the discussions?

R_J

@R_J said:
Do you know about the search function in the addons?

http://vanillaforums.org/addon/browse/plugins/recent/2&Keywords=ads

The Apt Ads plugin should be the most suitable plugin for that. And I think it would be better than creating a custom theme for it (you should create a cstom theme instead of changing the source code, like you've planned)