To let people in your organization start using Google Apps, you must add them to your account. You can do this from any computer or even using the mobile management console on your mobile device. In any web browser, go to admin.google.com and sign in with your administrator name and password. You also use the Admin console to manage users' services and passwords, as well as all other aspects of your account.
If you are unable to add users in your account to due reaching the limit, you must purchase an additional seats through Cube Creative.