I've literally spent about six hours trying to figure out how to enable the Joomla top menu in phpBB for Afterburner. The big stumbling block is that you don't seem to be able to do this without becoming a member of the site. It seems to require RokNavMenu, which is not a free extension. Otherwise, you don't have the menu files that it searches for. I think this needs to be made more clear to people, which is why I'm posting this here.