Here's a pic of the back oftwo jaz drives. The one at the top is a 1GB and the other is a two GB, though yours may look a little different.
The little termination switch says I A O. Seyt it in the middle to A and it will self terminate if you have no other SCSI devices connected (ornot if you do).
As for the SCSI ID. Set it to any number you are not already using apart from #6 as this is the ID of the MPC.
Then you will need a SCSI cable with 25 pin plug on one end for your MPC, and a 50 pin SCSI 2 plug on the other for the jaz drive.
I should warn you that jaz drives and discs have a bad reputation for **** up when you least expect it (so get your self some kind of back up) but hopefully you will have years of happy use with it.