Hi ctc2323,
To access your system, get into system programming. Feature 00, left intercom button twice. Enter #730 and input your password (choose one) The password is entered the same way you would name an extension, A=21 B=22 C=23 D=31. You have to hit "enter" to save this change. On a Partner 18D, it's the third button down on the right hand side.
For VM ports are entered into Hunt groups (#505, 7). Enter the ports the VM occupies. The vm card looks like a 206 card as far as the ports are concerned. You will use the last four ports on the card. They are counted up like the existing ports. To find them or confirm, just call the port on the intercom. Unassigned ports will say "transfering to the operator" (or close).
After you are done, enter #124 and press the enter key to save your changes on the card.
-Chris