Click on the module you'd like your new quiz to go and then click on the "Create New" button at the top right of the page.

Then click on "Quiz"

Then click the blue "Add Existing" button and select "Browse Question Library"

Click on the "Source" button at the top right of the page and select the quiz or question library you'd like to view.

Select the question(s) you'd like to add to your quiz and click the blue "Import" button at the bottom of the page.