Once you're logged in, you can add as many new users, with or without admin rights, as you so wish.
Firstly, you should click on the 'User Settings' icon in the narrow left-hand black toolbar on your screen. It looks like a profile page icon, and it’s third up from the bottom.
From this screen, you can clock on the ‘Add new user’ button, where you will be taken to the following screen to enter your team member’s details:
Once the new user’s detailed have been submitted, with a valid and matching password, you will be taken back to your ‘Edit Users’ directory screen.
Simply click on the blue ‘Edit’ button next to your user, click on the 'Add' button next to 'Roles' and select 'admin' from the drop down menu. This will give the user all the correct admin settings.