My advice is definitely POSITIVE PRAISE and TREAT REWARDS.
What I have learned is that a pup can't have too much free run for this to work. Keep them in a small area. I would make barricades for me and the 2 pups in the kitchen. The wee wee pad would be there and this kinda forces them to have more success at using the 'right' potty area. Then REWARD! It shouldn't take that long for them to realize what good potty behavior is - they want that treat.
Roxy and TJ didn't get free run until they were 1.5 years old. And in that time there was lots of regression with potty, so I had to keep going back to confining them and retrain.
Pups are lots of fun
