The last posting from your IP was less than 17 seconds ago. Please try again later. The thing you were trying to post was saved as a draft. This limit decreases substantially as your account becomes more established.
The waiting duration between two posts is depends on your rank. So, once you will be ranked up your waiting duration will decreased too.
Is it possible to remove the limit?
You cant do that before change your rank and also still there should have limit when you will be on the higher rank (legendary). The limit is to stop spam post.