Before getting started:
Be sure you have set up a new crew. If you need help with that, check this tutorial. You need a crew in your database to give user access to before starting this tutorial! We also recommend that you set up employees as well.
Open the admin panel from the upper right corner of your Cloud account (must be an admin)
Head to the green (+) Button on the left and enter a username, password, and email (ideally a real one)
Select your crew and employee from the drop down
Indicate your crew's permissions and hit Save!
For more details and a guided tutorial, check the video below: