The next time your dog pees on somewhere other than the pad clean it up.
Then put the towel you used on the place you want him to go.
Repeat step one and two.
When he pees on the pad give him a treat and keep repeating the steps.
If that doesn't work and your home a lot, try putting him on a leash and pulling him to the pad when he's about to pee
- Pee pad