1996 Saturn SL1 Tranmission fluid level

My Saturn has recently started shifting harder then usual. I check the transmission fluid and it is reading low (first hole on stick empty and below add line). I checked the manual on changing it, and it simply says "add until full". Not helpful I bought the fluid but need to know how much to add (in quarts)? I depend on the vehicle for long commute and don't want to overfill. Any advice would be appreciated.