From the top of your dashboard, click Build an Assessment.
Create an Assessment Name and select a Subject area and click Continue
Select the questions that you would like to include and click Save and Continue
Click here for more information on how to Build an Assessment
From the Assessment Settings tab, click on Questions. You will find the reload/refresh/redo icon beside each question. Click on the circular arrows to open up your Replace Questions option.
A popup window will appear giving you five different options with which you can replce the question. If you do not care for any of those options, click on Refresh List and it will load five more questions. Once you've found the question you want to use, click on Select Question and Save.
You will then finish creating your assessment and click Save Assessment or Save and Assign.