[y2ksw]

Originally Posted by bada_bing

Does anyone know which template and where to add of I wanted the banner to show up on left or right side of my forums ?

You may create a sidebar block for a banner.

If you however want to add a free space inside the page area, you must change a lot of pages, and maybe the everywhere sidebar is a better solution.

You may also try to add a background image via CSS, but I doubt it would work with this product, both because styles may be cached locally by your browser and maybe the templates are not passing through the last rendering process, because cached by vBulletin itself.