I’m signed in with Github, so I don’t really know how to change my associated email without putting in a mandatory password confirmation. Anybody has a fix for this?
You might need to hit the “forgot my password” to (re)set a password.
The canonical fix is to email me (jeremy@exercism.org) with a link to a GitHub Gist from your registered GitHub/Exercism account with the new email address on, and I’ll sort it for you 
(If you have access to your old email address that’s registered via GH, then Isaac’s solution will also work. But most people running into this have lost their email or shared GH’s anonymised email with us.)