Open the Settings tab on the bottom right corner of your screen

Tap on Change email address link under the User account section. Enter your new e-mail address. Re-Enter your e-mail address to confirm. Tap on the SUBMIT button. You will receive an e-mail message on the e-mail address you just changed notifying you of the change.

Your e-mail address is the username you use to log in to the SENSE4BOAT application.