Unfortunately, you can't do much with just the username / PW. Depending on what method you acquired the account with, it might be worthwhile to try and find more information about the account. If that's not possible, you could sell the gold (if it has any), scam gold, or give it away. If you do manage to find enough information to get full control, well theres still not much you can do that's profitable. Someone might be interested in the twink if its good enough, but a 63 DK is worthless. Good luck.