1. The first step to adding bonus questions in a quiz is to open the course Homepage and click Grades.

2. Click Quizzes

3. Click the arrow next to the appropriate quiz.

4. Click Edit

5. Scroll through the list of questions and select the check box for any questions you want to be made bonus questions.
If the question doesn't exist, create it first.

6. Click More Actions.

7. Click Toggle Bonus.

8. Click Save and Close.
That's it. You've added bonus questions.

Interactive tutorial