Profile
Profile is about you, not the account.
Account information. Change your Full name and Email address. Changing the email sends a verification link to the new address, and the page shows Email not verified until you click it. To change your password, fill in Current password, New password (at least 8 characters) and Confirm new password. Leave those blank to keep your current password. Click Save changes.
Connected accounts. When Google sign-in is available, connect or disconnect your Google account here. If Google is your only way in, set a password first; the page will not let you disconnect otherwise.
Trusted devices. The devices that skip the authenticator code for 30 days, with when each was last used and when it expires. Click Remove on any device you do not recognise, or Remove all to require a code on every device at its next sign-in, including this one.