Follow these steps in order to unpublish your challenge:
Login to your CodeMonkey account.
Click on ‘My Creations’ on the left-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.