The form is for a motion. When you file a motion with a court, you must first obtain a motion date from the court, and must properly serve the other party with all documents relating to that motion date (the motion, notice of hearing and possibly also a praecipe) in advance of the hearing date. There are legal requirements for how much notice must be given, such that the other party has the opportunity to respond and appear.
If you do not have current contact information for your ex, so as to serve her, you should try to find her current address. Most people are not difficult to find. If you are unable to track her down despite diligent effort, you can petition the court to allow substituted service.

