C9 install throws a 403 Unauthorized Request after changing password



I created a workspace a while ago, and I logged in using the command line but entering c9, and then entering my user credentials. Since then I’ve updated my password, but now if I try to install a new plugin, I get a 403 Unauthorized Request. I believe it is due to the changing of my password, and it is trying to use my old password to authenticate.

How can I reset the login credentials on the c9 command line tool?