"Text Ads"

I tried using the "search" feature first and I couldn't find what I was looking for so I'm just going to ask and see if someone can help me.

I would like to be able to add "text ad" at the bottom of the index page of my forum. Rather than just have a stationary affiliated banner at the bottom of the forum, having a place where 3 or 4 sites can be advertised by adding their affiliate button and some text describing their site. Is there some code for this that I can add when I go to my admin panel?