Hi and welcome to YT!
There is actually a spray that you can buy in most pet stores (or online if local stores dont carry it) that you can spray on the pee pads. I used one when I was training Scooter to use the pads. I trained him to go outside but he is really funny about getting his feet wet when it has rained. I would buy specially scented pee pads or spray one of the pads with the potty spray. Be very careful to only spray one of the pads and do it outside, otherwise you will leave a scent for them to pee on the floorboards or other floors. By only spraying one of the pads you lay down, you will encourage Killer to pee/poop in a very specific area, not anywhere he pleases.
It can seem like a pain but once you get into a routine, it is much easier. Scooter was a pain to potty train initially but he figured it out. Good luck!
