Follow these steps in order to unpublish your challenge:
Login to your CodeMonkey account.
Click on ‘My Creations’ on the right-side menu.
Scroll all the way down.
Under ‘My Published Challenges’, locate the challenge you would like to unpublish and click on the down facing arrow.
Click on ‘Unpublish’.
In order to publish the challenge again, you would need to go to the original challenge (under ‘My Creations’) and redo the publish process.