Unknown user name and password

I’ve been trying to update my blog but for the past several days each time I try to save anything I get a drop-down menu requesting a user name and password. I’ve tried all the user names and passwords I can think of but none seems to work. Instead I’ve been getting the following notification: “The user name or password you entered for area “Magic” on http://www.browde.com:80 was incorrect.”
I don’t know what user name it’s asking for. I called my provider, 1and1, but they haven’t been able to help me. Does anyone know how to resolve this?