How do I find out a mingleville password without knowing anything bt the user ID :confused:

You don't and please don't ask us to help you break the law. You have no right to know someone else's password.

The only way would be to go to the support on the site and asked to have the password emailed to him, but then again you'd need the persons email and password and probably security questions will be asked. If it's a significant other you think is trying to hook up online just confront the person.