I also noticed that in the instructions it says:
5.) vbPortal/vBulletin header-inc.php Visual Integration |
If you use vbPortal or vBulletin, you can integrate your forum's look and feel into PhotoPost. The vbPortal integration displays your vbPortal top/left side, and bottom, around PhotoPost. The vBulletin integration displays your default vB header/footer templates with PhotoPost. To implement this, open header-inc.php and follow the instructions there. vbPortal users should only edit the vbPortal section (not the vBulletin section), and those who use vBulletin only should only modify the vBulletin section.
.. but I do not see any instructions in there for vBulletin (I do see the vbPortal instructions near the bottom though)