Sign in to your account and click 'My Account' in the top right-hand side of the dashboard, and then click on My Account.
Select 'Users' option in the My Account navigation section.
You will be taken to your current list. Click the 'Add New User' button.
You will then be prompted to provide user details. Be sure to select the access level of the user. Once the details have been entered click 'Create New User' and instructions will be sent to the user's email address with how to complete their account setup.