How to Add an Ad Above the Who's Online Box on vBulletin?
Log in to your vBulletin Internet forum with your administrative user name and password. Click the arrow next to "Styles & Templates" and select "Style Manager" from the drop-down menu.
Choose "Edit Templates" from the drop-down box next to the forum style you want to edit. Locate and double-click "Ad Location Templates" in the list to the left. Locate and double-click "ad_board_after_forums."
Add the following code into the large text field under "Template":
<!-- add this part here -->
<td class="tcat" height=100><center><!-- insert ad code here --></center></td>
<!-- end additional code -->
Substitute "<!-- insert ad code here -->" for the coding used for your banner ad. When finished, click "Save and Reload."