Here are some instructions for a '90-92 Trofeo; they may or may not work on your car:
http://home.thezone.net/~trofeo/toronado/tororke.htm
Otherwise, go on eBay and get a factory GM service manual for your car---they seem to go for around $35, often less. You'll have a wonderful manual for working on the rest of your car, and it also has RKE programming instructions.