Clean reinstall: how to?

I want to switch my user account on the Squeezebox server to another option. Entering the username and password is done on the Squeezebox server on the initial administrative screen when Max2Play is first installed. How do I get back to this initial screen to change user accounts? The option of entering username and password under settings does not allow mysqueezebox.com to recognize the server or player. Apparently, this has to be changed at the initial activation screen, but I don’t know how to get back to that.

Thanks. BTW, Max2Play is great. Thank you for developing and sharing it!