If you're logging into Paragon Chat, on the Paragon Chat login window that opens before the client does, use your Titan Network username (same name as forums, wiki, and Paragon Chat, they're all linked), and your forum password. The client screen asking for a Login name is for storing characters on your system, it can be anything you like, but use the same Login name each time so you see your characters.
If concerning SCORE, we can't assist with any
issues logging into the game server.