Hi Mick. Congrats on finding the Squirrel. A darn good piece of equipment.
If you've installed the Squirrelprogram, then you're halfway.
Is there a CD0 in your DEVS drawer? Take it out of STORAGE if its not there. From the WB, click once on CD0, and choose info from the icon menu. The device and unit# of your CDdrive should be listed. Write squirrelscsi.device and whatever unit number your CD is and then save.
edit: of course, the last device in the SCSI chain HAS to be terminated.