Use your Elon email username (example: jdoe) and password when creating an account.
Once you complete the validation part of registering your mobile phone, the next page will say "You have successfully signed up." You will see a "log in" button for your new account. To complete your registration, you must open your account and enter your email address, then click the ADD EMAIL button. You will instantly be emailed a verification email you must open and click on the validation link. Be aware that the validation email could be caught by your Junk Email filter. You may register two email addresses and two mobile devices – it's very easy to do.