There will be times as an admin that you will need to reset or delete a challenge.  For example, a player makes a minor error on a score report, or a player gets injured and needs to pull out of the ladder.  
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​To reset or withdraw a challenge completely, click on a ladder, and then PLAYED CHALLENGES under Ladder admin menu.  

You will then see options to both RESET which keeps the challenge but resets the score.  Withdraw removes the challenge completely.  

You can also EDIT THE SCORE of any match by clicking on the "EDIT SCORE" above.