From the Qbank page, click Create New Practice Set - this will navigate to a different page where you can create different question sets that will be displayed in a list on the Qbank page. See this article for details on how to customize a question set to your specific study needs.

To delete practice sets from your list, click the trash icon highlighted in red below.

To retake a question set you've already created, click the Retake icon. You can retake an NP question set as many times as you want. Each time you retake a question set, the new attempt appears in the dropdown. You can view the results for all of your attempts.

To view the stats of your practice sets, click the dropdown in the lower left.

To rename your practice set, click the pencil icon next to the Practice Set name.