You need to restore a database, by the sound of it. Assuming it's a large database, and with your forum profile showing you as Website Owner, you might do better to speak with your Hosting Provider about this. I assume you have a backup of the database?
The easiest way forward might be to upload a copy of that backed up .sql database file to your account and then contact your Hosting Provider, tell them where its at on your account, and have them restore it to your account for you.
HTH!