On the left hand side of the Dashboard click on Admins and Roles
Use the add admin tab to enter the email address they will use to login to the system (please choose this carefully) Fill out the details with the entries in red being required.
An extra email address can be added at the bottom Tick agree to {company name} privacy policy Click on Proceed System defaults back to admin screen showing new admin entered and details.
The new admin should receive an email with the login link.