Placing your pee mat, is actually one of the main factors to if your dog uses the mat. It should be a visible area, preferably near the dogs cage. If you are using a pen, check this out.
Allow your puppy to check the pee mats out, sniff it and stand on it. When your puppy walks on the mat, say “go potty” or, “go pee”.
When your dog poops or pees, say “good puppy” and give your dog a treat.
Make sure to stay consistent.