Here we go with Synapse configuration options in RokBB3 panel:
Display user menu - you can enable/disable displaying User menu on your left/right column. Usefull when you don't want to use Joomla menu on top.
Show joomla menu - this option will enable/disable a menu from your joomla instalation.
Joomla menu path - this is a path to directory for pre-generated joomla menu stored in .txt file. This is usually created by special component for joomla called RokBB3 Menu Generation.
Font family - select a default Font-Family for your website.
Header/Footer Style - - select a default header and footer from variety of options for your phpbb3 template.