Hello, if I am understanding you correctly, here is how you "change your email address and password in your profile settings": 1.) Click the Firefox menu icon* (*looks like a stack of three horizontal lines) 2.) Click your name, usually with an arrow pointing to the right off to the side of your name 3.) Click "Manage account" 4.) Add your new email as a secondary email, verify it, then make it your primary email before deleting the old one. Password can also be modified in a nearby relative area where you change the email. I hope this helps! Please follow up if the solution worked or didn't work so other users can learn as well.