Hey
When installing a new forum you would also need a new database and username for it.
There are two possible configurations. If you are a cPanel user this article will help you create a database and assign a user to it:
http://wiki.lunarpages.com/Setup_MySQL_DatabasesIf you are on a LPCP server then you should review
http://wiki.lunarpages.com/Create_and_Delete_MySQL_Users_in_LPCPRegarding the database type, it will always be MySQL while the hostname should be "localhost" for cPanel accounts. If you are on LPCP then you would need to log in your LPCP account and you would find the database server on the right informational menu next to "DB Server"
As for the username, database name and password, they will be the ones you have already created.
If still unsure send a question at
support@lunarpages.com with your username, and server and some of my colleagues will provide you with assistance.