The PDF version of these forms are FILLABLE. They can be filled out electronically, then printed.These forms and instructions are available in the General Clerk's Office, Room 108, in the Nassau County. The State Court website has a Guardianship Portal with information about the guardianship process and programs as well as a search tool for finding a guardian. Use the judge's title properly, but only once in the salutation. How to Open an Adult Guardianship Case. If you want to be the guardian over an adult, there are many forms you must fill out to open a case. 1. Fill out completely, sign where indicated, make copies and file: Appearance,. Letters of Guardianship - LEG - LEG (GUA). LETG. Letters of Guardianship - Temporary - LETG (GUA). GLOSG.