Try rubbing or scratching the post with your nails. Stroke your kitty back all the way to the tail. This causes many cats to raise their front paws to the post. Speak pleasantly to the cat even if he only comes up to inspect the post. A good place for the post is where the cat sleeps or eats.
Praise speeds the learning process.
You may think your cat is not listening, but she knows when you are happy with her. Continue to praise her when she scratches the post. Consistent scolding is also crucial. It can help break the habit of raising paws to the wrong objects. All furniture should be off-limits to the cat.