Deleting a challenge will delete all User Accounts and Communications associated with it. Since this action cannot be undone, it is important to make sure that no User Accounts that should still be active are associated with the challenge and that you do not want to keep any of the emails or the Bulletin Board from the challenge for future use.
To delete a challenge, go to Programs > Wellness Challenges and select the Delete icon under the Actions column on the same row of the challenge that you would like to delete.