I adopted my adult cat (3y) two weeks ago. At that time he had has nails trimmed at Petco. I have notice that he scratch my bag sometimes, so I took that away. This morning I found he has instead scratched the couch, so I bought a scratch post for him. Since he showed no interest in the scratch post, I got some catnip and sprayed it on the scratch post, but he merely ate the catnip from the scratch post but didn't scratch it. How do I get my cat to use the scratch post and not the couch?