Sprinkling catnip on the scratching posts will attract them to the posts (might not work right away, some kittens ignore catnip till they're older). I hate that catnip leaves a bit of a mess so I spray it with the liquid catnip. Works just as well with my cat. Since we do that it helps when we buy him new scratching posts, beds, toys, etc. We spray it with catnip and he knows it's his.