SwitchMe Multiple Accounts Key

I bought it but it doesn't even open to see what it does only showing me one option is (refund)

NEW: After the 2.0 upgrade, the password is no longer required BEFORE switching the account but only requested as a regular login-password into the profile. This was an absolutely crucial feature (don't want anyone playing around with my phone even to be able to boot into another account) and now it's completely gone. Previously, I set one password to switch the profile, and another one as the login PW (2 step security), this is now impossible. Was also the only reason for me to buy the app in the first place - at the current setup I consider it a waste of money. Uninstalling & Reinstalling (as suggested in the changelog for some issues) didn't change anything, so I must assume it is either a bug or actually wanted to be like this. Also the new UI sucks - previously I selected one of the other profiles, and hit the "switch" button at the bottom; now I have to click this stupid "PLUS" which then reveals the switch button. Why complicate it??? Will downgrade instantly until the issues have been addressed. What a sad development.

I have buy the key but it shows the msg that "You have not granted superuser permissions to the application"...now what i have to do to activate the key.