Did you originally register your account using Facebook Connect? If so, the community won't have any password information stored for your account and you will need to login using your Facebook credentials.
If you wish to disconnect from your Facebook account, you can do so via My Settings - Social Connect - Facebook Connect and clicking "Disconnect from Your Facebook Account". You should be prompted to pick a password for the community.
Don't hesitate to send me a private message if you need additional assistance with your account!
=============================== Julie Hamel - Global Community Manager
New to the community? Can't find where to post? Visit our guide to the new Lithium Community.