Here's How It's Done:
Navigate to your organization's Settings.
Choose "Admin Roles"
Click "Invite Admin"
Type in the email of the user
Choose the role for the user - Manager or Admin
Click on "Send Invite"
The user is invited to the account as the administrator or manager. Please note that you can also edit the manager/admin privileges. Click "Edit" and choose a preferred role if you have made a mistake.
The difference between an admin and a manager is that a manager can only invite employees and assign the courses. In contrast, the admin has an insight into the Plan&Billing and can invite people to the manager/admin position.