If you want to pipe in custom variables or variables from previous questions and customize the follow up questions, click the arrow next to Insert Variable right above the Question box, and select the variable you want to use from the list. Read more on
Piping.
You can also use these
custom variables while piping. If you already know the respondent of your survey, for example, you can personalize your survey by removing the Name question, and creating a custom variable instead.