The General settings include the name and description for the quiz:

The Name of the quiz is displayed on course's home page, and Description is displayed when a student selects the quiz.

The Description should explain why the student is taking the quiz. It should also inform the student of any unusual features of the quiz, for example, whether it uses an animation that requires the Flash plugin or whether it uses a pop-up window. Remember that once the student clicks on the Attempt quiz now button, they are into the quiz, so give the student everything they need to understand why and how to take the quiz before clicking on the Attempt quiz now button.

Optionally, you can display Description on the course's home page. If you do this, it will continue to display when the student selects the quiz.