To answer my own question, its not obvious but I did find how to do it, so putting it here in case anyone else needs this. From the home page, select Plant Info, and then click Edit and scroll down
Hi just got a rooftop PV and Solis inverter. I've gotten the app installed and working. During setup it asked me for a tariff and I think I made an error. I can't see how to view / change it. Anyone any ideas? Thanks Steve