You can follow these three easy steps to direct customers to your quiz using a button:
Copy your quiz URL from the Publish page.
Go inside your store’s theme editor
Choose the button that you want to use to redirect your customers to the quiz. From the menu on the right-hand side change the button’s label and paste the copied quiz link in the Button Link input box.
Don’t forget to save your changes and make sure to test that it works as expected.