It is just a document you can type out and then fill in the blanks with a pen. For example “I, ____(your name)____, residing at ____(your address)____, appeared in person before the undersigned notary public and under oath make the following statements:”
Then list your birthday, birth country, citizenship, passport number, divorce date and state you are currently single and able to remarry.
Make sure it’s notarized and that should suffice.