Minimum post count to upload Avatar, Photo, Sig

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How would I make it so that a user would have to have X amount of posts to upload an avatar, photo, sig, etc.? I want the user to know that they need X amount of posts.

I've tried using the promotion system, but it doesn't tell the user why they don't have the permission to perform certain actions.

Thanks guys.

if condition statement would work right? but i don't know variables