I had to retrain my Lady when she was nine years old after I was in a car accident and not able to walkher outside for almost a year. I put the pads right by the back door where she always scratched to go out. I used a light Seabreeze expen to put around the pads at scheduled times - after meals, a nap, when she asked to go out, etc.
Make sure you stay right with her so you can say "good potty" as soon as she goes so she makes the connection. Then do the happy dance and give her a treat.
It took old Lady about three days to learn and she's not the brightest dog I've ever seen!
