When managing variables, what action should you take if you want to modify a variable?

To modify a variable, the correct action is to click on Edit. This option allows you to change the existing values or settings associated with the variable. When you select Edit, you can explicitly adjust the variable's parameters to suit your needs.

The other options serve different purposes: clicking on New is for creating a brand-new variable, while clicking on View would typically allow you to see the current state of the variable without making any changes. Clicking on Delete would remove the variable entirely, rather than altering it. Therefore, if the goal is to make modifications to an existing variable, the Edit function is the appropriate choice.