oil change 1995 Saab 900 2.3

Where is the drain nut to remove to do the oil change....Next to the oil
filter??? driver side or passenger???

Do you mean the drain plug?

Because oil is drained by gravity I would look for the threaded drain
plug at the lowest part of the sump. Your question makes me think that
you have never done this before. I would at the very least consult a
service manual with pictures before attempting an oil change. A better
solution would be to have your local oil changing professional do the
job.