To manage new users to your site you must be an Account Administrator.
How to Invite New Users to Your Account
To add a new user:
Open your Account settings by clicking the Account icon at the bottom of the left panel
2. Navigate to the "Team" tab, Click on the blue “Invite User” button.
3. In the window that appears, fill in the name and email of the new user and choose a user role.
4. Click “+ Invite ” to send an email invitation to the person.
The user will receive an email like the following: