If you fancy an adventure, head on over to http://test.drownedinsound.com
Log in, and go to your profile. Click the Facebook Connect button, and enter your Facebook details.
Your account will be linked to Facebook! This means: one button to sign in, no password to remember, and you'll be able to do a few other nice things when the time comes.
If you don't have a DiS account, click the Connect button at the top of the page. Enter a username, and you'll have a brand new account.
Along with all of this, I've spent loads of time fixing lots of the logon weirdness. Let me know if things seem sorted.