I ran into the same issue. What you are probably referring to as the header is actually the Navbar.
What I ended up doing to solve the problem was using one of the navigation modules for vBadvanced and cutting it down to just home page and forums. Made it one of the custom templates, then moved the custom template to the top of the stack above the stats block.
I don't mean this in a bad way, but I am a little disappointed in the photopost pro that it's not more integratable easier with vBadvanced. I would have thought it would have been pre packaged to do so given that both products are from the same manufacturer. I've found a hack or 2 to do it but so far neither have worked at all.
There should be a prepackaged way to integrate photopostpro with vBadvanced the same as you can now integrate the forum. That way the side boxes on all my pages look like they came from the same design. The photopost boxes aren't that swooft looking IMO compared to the vBadvanced boxes and they are 10 times harder to edit. I generally edit something like that in dreamweaver, but with all the php in the templates my dream weaver won't display the template into something I can see.