Jesus, that didn't take long.
They have a contact form for support:
https://www.mechbunny.com/contact
Presumably, you got someone else/your host to do your install, cos username/password can be changed as many times as you want yourself, just by quickly editing two lines in only config file the install asks you to edit. Just read the install notes.
Never mind, saw you paying someone to do it. Konrad's gonna love you. :=D