Problem spotify

I dont know what happens but MY O.S is linux and when I change something in the config it doesnt make changes, I restart mopidy but nothing changes always this Found spotify configuration errors, the extension has been automatically disabled:
WARNING spotify/username must be set.
WARNING spotify/password must be set.
WARNING Please fix the extension configuration errors or disable the extensions to silence these messages.

How exactly are you making these edits. Please post your command set.