Lucent partner phone system

I moved in an office with a Lucent Partner phone system: 308 EC Mod R 3.0, 206 EC Mod R 4.1, ACS Proc. R 3.0, 400 E Mod R 3.1, and Partner mail VS R 5.0 I found where to plug in my 2 incoming phone lines and fax line and can call in and get the call but the prior guy's recorded greeting comes on. How do I get rid of that greeting and make my own? Is there a web site with simple instructions on how to use the phone? Basically I just want each phone to have the two incoming lines and one jack to be the fax line.