Erm, why don't you use another kind of forum solution other than phpbb. phpbb is not a very good format for a forum, although it is mostly used and free..

I would suggest MyBB(since you have a website, you can download it for free and host it here or go to a free MyBB website and use your URL to host it) or vBulletin(you need to pay for it) as they are more professional forums compared to phpbb..