Editing a variable from a model
                                            - In the database Model window, move the cursor to the variable grid containing the variable you want to modify. Right-click and select Edit <variable name>.
 - In the Variable window, change the information as desired.
 - When you finish making changes, click [OK] to save the record.
 - Click [Close].
 
For more information, click 
 on the title 
 bar of the window, and then click a field or button.