You can access the User Management capability by selecting your name from the top nav menu and selecting "Manage Users" (see below). You will need to be either an Administrator or an Owner to access the user management.
Invite New Users
You can invite new user(s) by clicking the "Invite User" button and entering their email address. Once you select and Save, we will send an email invite to those users. The user invite link expires in 15 minutes.