To award points to a player who may have answered a question incorrectly click the icon in the Award Points column on the Players list in the Challenge module on the CMS.
Once the icon is clicked it will open a window that shows all the questions that player has answered as well as whether or not the answer was correct.
If a question was answered incorrectly and you want to mark it as correct, click the hyperlinked Incorrect so it changes to Correct. This will award the points to the player for that question.