Fill it out: In addition to the payee's name, you'll need to add your name (and maybe your address) and sign the money order. Refer to the below instructions to learn how to prepare a money order for your OPT application.Check that the money order amount is correct. 1. Write the recipient's name on a piece of paper. Fill out the money order at the counter with a retail associate. Pay the dollar value of the money order plus the issuing fee. (1) Self-explanatory (Voucher number is preprinted on form). (2) Insert date amount was charged. The money order has a purchaser section, which you'll fill out with your name and address. A filing fee is required for many immigration forms.