YOU CAN MODERATE A QUIZ FOR ONE SINGLE STUDENT.
Step 1 - Click the quiz name.
Step 2 - Click Moderate Quiz from the tabs that appear on the right side of the screen.
Step 3 - Click the box next to the student that you want to moderate quiz times or attempts.
Step 4 - Click the Edit button and add extra time.
Step 5 - Click SAVE.
You have now moderated a quiz for a single student.
I was very frustrated until I figured this out. Hopefully, this explanation is helpful for others.
KERRY WEBB
Thank You for posting your step-by-step procedure here. There really isn't a question in your posting, but I did want to point out that there are a few written Guides that are available that help explain this process as well:
I hope these extra resources will be of help to you, Kerry.