Straighten The Rug
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This is a pretty efficient method that takes approximately 7 days to work.
Straighten the rug. Before you start trying to flatten a rug on your own you will need to assess the situation and look at the rug you have. Remove creases from a small rug. Follow this diy guide to choose the ideal flattening method for your particular area rug. Flatten the rug by applying weight evenly and firmly.
Then remove the paper covering the adhesive and smooth the rug over the floor. If the rug is too large you can always rotate it as the edges flatten out. Small rugs are quite easy to flatten out by using the weight of your mattress. Most people want it to lay flatter faster.
Press the tape down firmly smoothing it as you go. Carpet tape works on hard floors and on existing wall to wall carpet holding your rug in place to flatten existing creases and eliminate new ones. Allow this to dry this way and see if it helps. Of course over time the rug will eventually flatten out on its own but that is assuming that you don t continually fold that edge over from stepping on it.
Place the rug flat between your mattress and box spring.