I will first verify if your wordpress and phpBB 3.0.x are compatible to install the flawless bridge. (it will cost you 1 additional gig , or I can send you all the documentation and you see by yourself if it's compatible or not)
If it's compatible, I'll install the bridge for only 1 or 2 gig!
phpBB Tapatalk is NOT supported.
Wordpress plugins as WPJobBoard and NextGEN Gallery take over an variable ($db) which makes it incompatible with the Bridge.
The developers needs to fix this (fixable) compatibility issue!
If you are using GoDaddy's WordPress hosting, forget about this, GoDaddy installs a heavily-modified version of WordPress.
(The only solution is changing host. I provide host services too)
If you're using phpBB themes from RocketTheme, forget about this too. These themes are designed for integrating with Joomla, not WordPress, and they are well known for their compatibility issues with phpBB MODS. I can try to integrate, but it will cost more gigs.
If you want to Bridge Wordpress with phpBB3, you're on the right gig!