The Imail Program is one of the easiest programs to set up. Once yow get into it you should be able to walk yourself through it..
1. In your browser type:
http://www.yourdomain.com:83832. Login using your admin account:
admin@yourdomain.com - And then your password.
3. Choose from the Administrative Account Option and select User Administration
4. Click the add button in the lower left hand corner.
5. Fill in the information and hit the save button.
6. Repeat for each user...
Hope this helps!