Go to ea.com and log in using the email and password.
Once inside check that your primary EMAIL is VERIFIED and is email address that you will not lose access to-- school and work emails are bad for this-- and add a real mobile phone number (useful as alternative methods for security codes), then verify all your details.-
Once you've checked everything, change your password to be less than 15 characters with only letters and numbers in it.
(It can take a couple minutes to reflect it in game) Do not change your password while the game is open on a device