There are two commands which you can choose to perform operates on any variables selected in the Variables area. These are both available in the Debug > Variables menu or from the popup menu of the variables list itself.
The standard action commands are available in the Debug > Variables menu. For more details about these commands, see Performing operations on selected objects.
Choose Debug > Variables > Set to set the values of any variables selected in the Variables area. A dialog prompts you to enter a new value to which the variables are set.