To create a new user for your store, go into the Admin Interface, click the Users tab, and click the New User button.
There are three mandatory fields (“Email”, “Password”, and “Password Confirmation”) as well as Roles checkboxes (“Admin” and “User” are created by Spree as a default, there is a possibility to extend Roles with backend work).
Once you have created an account, you are redirected to a User editing page which you can find out more about here.