Same question. I'm running vBulletin 3.7.1 patch 2 and vBGallery 2.4.3. When running previous versions I found instructions somewhere on these forums for changing the base breadcrumb link from HOME to FORUMS. Changed the link title and the URL where the link pointed. May have been a template change, but it has been a long time and I don't remember for sure.
Searched these forums again now and can only find instructions for header replacements and navbar replacements. I don't believe these are the solutions I'm looking for.
Help will be appreciated. Thank you.