To create new users or edit the ones already in your account, tap on Users on the main page.
Tap on the plus sign (+) in green on the upper right-hand corner of the screen.
Fill in the Name and Email of the user and press Next.
Now you will decide if the user is an administrator or if it needs specific permissions since administrators have full access to the account. Just remember to select Allow use from a personal device if the person won't be using the device you are creating the user on.
After the permissions are set, all you need to do is create a password.
All set! The user will receive this information on the email used to create the user login. You can also share it yourself, if you want.