To create a new user account, log in with your administrator account and click 'Manage My Organization' from the Dashboard.
From the Organization Management page, click 'User Accounts'. On the 'User Account Manager' page click 'Actions' and then 'Add User Account' (note - you can also send reminders to pending accounts from here. Pending accounts are accounts that have not yet verified).
This will bring you to the 'Create User' page. Here you will enter the user details and the user to departments and locations should you choose to. You will also set the permissions/special roles for the user. You can learn more about user permissions here.
Once you have added all of the information click the 'Add User' button in the lower right to save this user.