If you signed up for MouseMingle.com using the password of "password", you'll be signed in automatically when you click on the email verification link. However - you won't be able to sign in again when you return in the future. You'll get a message about having a bad password.
You'll need to change your password to something OTHER than "password" to be able to sign in. Just use the "Forgot Password" link on the Sign In page.
Please contact us if you're still having a problem.