To update an existing parameter field, move the cursor to the desired field on the Parameter Form Picture screen and press the UPDATE <F4> key. Menudef displays the Parameter Field Description form in UPDATE mode, and you can change data in the Parameter Field Description form fields. There are three ways to leave UPDATE mode and return to the Parameter Picture screen:
Press STORE <F5> to store the changes.
Press DELETE (<F1> followed by the D) to delete the field.
Press CANCEL (<F1> followed by the X) to cancel the changes.