If you want to change the email you login with then follow the steps below, if you want to add a new user to your account you can add them as an admin by following the steps in the article here.
From your Dashboard, click on the drop down menu in the top right corner of the page.
Click on your name under the ‘Fatsoma Account’ heading.
You will now be taken to the customer site, where you can manage your user.Click on your name again, now in the top right corner of the page.
Select ‘Settings’ from the drop down menu.
Enter your new email address under the heading ‘Email’.
Click ‘Save’.
Congratulations, you have successfully changed the email address on your Fatsoma account!