How do I add a clause to a legal seperation form

Hello, Anonymous. If the Separation Agreement has already been entered by the court, then it stands as an existing court order which is only modifiable by the Judge, and the only way the Judge can modify is to show that there was some sort of error or possible malfeasance by one of the parties that should render the existing Agreement void. If you can show this (and showing this is a difficult task), then the Judge may, and I stress "may," vacate the existing order. But be warned. Vacating the existing order essentially renders the previous Separation process moot like it never happened. You will have to go through the entire process again, in addition to the process of trying to convince the Judge that the existing order should be vacated, which, again, is a very difficult task.