@videogamesaver
BTW, what is your forum software do you use now? If you use SMF, I'll tell you how to 'migrate' it into phpBB3 system. If you only want to change the forum theme, I don't have a suggestion to you.
i think he is currentoy on forumotion, do you want to still be with with forumotion and change to phpBB, or are you planning to host a phpBB forum your self?
Ask them to see if you can get a backup of your database and then a copy of all your files. sign up to a free webserver like "phpzilla"
copy all your files onto the server "htdocs" go into myphpadmin go to import. find your zipped backup. it should upload. when that is all complete you should see your own forum....
Then update it to the the latest version you can of phpbb3, then update to the most recent..
(if forummotion has a style called prosilver then it's phpbb3) (if it just has subsilver and no prosilver then It's phpbb2)