How do I fold the mail sail?

I sailed my 1984 O'day Daysailor for the first time yesterday and was very pleased with her. Like a dummy, in too much of a hurry, I did not watch how the main sail was folded but it was neet and tidy. When I finished sailing and went to fold up the sail, I had no idea how to fold it to get it back in the bag from whince it came! Help!!!! Yes I am new to sailing for sure!
Dan Steill (d.steill-at-gte.net)
Dan Steill (d.steill-at-gte.net)