For my instruction, I am using the book Potty Talk by Toast by Trisha Yeager Menke. I found her book to be the most honest and true to everything else I had read on the subject. If this doesn't work out, I will in no way put the blame on this book but rather my misunderstanding of the instructions.
So, as you can see we have the current litter box next to the toilet. It's been here for a while and the cats are very used to using it in this location.