I have only this addon active. The default interface is showing. There is no addon tab in the Interface window. The reputation tab is the default. Is there some undocumented command to start the addon?

Without a broker addon, there should be a minimap button you can mouse over. Generally it's made to be used with a broker display addon such as my own ButtonBin. I haven't run it without a broker for a long time.

I installed ButtonBin, and SexyReputation is on that bar. However, SexyReputation does not appear on the minimap with or without ButtonBin. I will use ButtonBin as a workaround.

I tried another button manager, MinimapButtonBag. With only it and SexyReputation running, no buttons appear in that button bag.