You can change your email address in your SamBoat personal space, under My account > Modify my information.
By clicking on "Email and Password" in the left-hand column, you can change your email address and/or password.
For security reasons, when you change your email address, you will be asked for your password.
If you have forgotten your password, go to the "I have forgotten/lost my password" help section.
Be sure to click on "Save my changes" so that we can take the changes into account.