As a Team Admin, you have control over your Users and what machines and resources they have access to.
Adding a User
To add a User, simply click the Users button in the bottom of your left-hand navigation. You'll see all of your existing Users if you have any, clicking the green "New Users +" button, you'll be prompted to create the user, set their password, and determine if you'd like them to have Administrator rights.
Your user will receive an email that they've been added to your team.
When you create a machine, under the Machine Details section you have the option to assign the new machine to an existing user on your Team, or create a User to whom the machine will be assigned:
If a machine is already created and you'd like to assign it to a user, you can add them as an Accessor.