Account
Everything about your sign-in, in one place.
Profile
This is the name on your forum posts. Everyone can see it.
Email address
Password
This account signs in through Google or GitHub and has no password here. Nothing to change.
Connected sign-ins
Every connected way gets you into the same account. At least one has to stay — otherwise you would lock yourself out.
Sessions
This signs you out in this browser. Other devices keep their session until it expires — revoking those needs the licence service, which does not do it yet.
Delete account
The account and its sign-in go for good. Forum posts stay, with the name that was on them — otherwise every conversation they are part of would fall apart.