You can easily change your information when you're signed into GovernorHub by clicking on your name at the top of the screen (your name will show where it says "Romilda Vane" below).
You will then need to click on the 'profile' option.
This takes you to your profile page, where you can change or fill in your:
email address (note: this will change which email you use to login with)
To change your email address, click on the “Edit contact details” button.
This will open a form where you can easily update your email address. Don’t forget to click save before closing!
( * IMPORTANT * If you update your email address or password, remember to sign in using the new details in future!)