Can't Login to App "That user already exists"

Trying to enter my username/email from the site leads to the same error message:

WeMod Error1

Am I doing something wrong?

You are trying to sign up for a new account. You need to sign in to your account by clicking the drop-down in the upper-right then select “Switch Users”

Excellent! I thought I had been clicking that, but you’re right - all logged in now!