No information is available for this page. This guide is designed to teach you how to write a letter of instruction for heirs, or anyone else who may benefit from a little more direction.To quickly search for a notice or letter on this page, you can press Ctrl-F in most browsers and type in the number or name, then press Enter. In this video, we're going over two forms, DE 140 which is the Order for Probate, and DE 150 which are the Letters, Testamentary, or Letters of Administration. If you are self-employed, you must attach the last. We're going to be going over two forms de 140 which is the order for probate and de 150 which are the letters testamentary or letters of administration. Instructions for completing an application form 201. Download and fill out the application form on a computer. 1) Fill out UC Application. This is used to apply to all UC campuses.