Carol, you create a quiz by setting up a Quiz Activity (which
you've done). And then adding the questions to the Quiz
Activity. (Which is where you are stuck.)
You've said that you have already created the questions. (A good
thing.) Now you have to add the questions (which are saved
in the Question Bank) to your empty Quiz Activity Shell.
Here's a how to video to show you the process:
I hope this solves the problems.
Take care! Dennis