User Accounts are a Function of the "Setup" Tab. Click the Setup Tab, and then Select "Users".
Once there click "Add a New User" button.
Enter the new user's email address as the "User ID" and click "Add the User ID".
Fill out the information for the new user. (NOTE: Make sure to Click "User Capabilities" button to assign privileges to the new user.)
Click "Save Changes".
Click on the new user you added in the TablePane and click "Send PassCode". This will send a temporary passcode to the new user(at the email address provided). The new user will be required to reset this passcode upon first login.