Both parties MUST have valid, current picture identification. The identification must be government-issued.An Application for Marriage License and an Affidavit of Inability to Appear will need to be obtained from the County Clerk's Office. Much confusion surrounds the need to submit I751 affidavits and how to write them. We explain and provide an I-751 affidavit sample. Complete the form ensuring all of your information is accurate. You must appear in-person at a Riverside County Clerk's office counter to obtain your license. A simple letter of some sort where you write your name and details stating that their relationship is for real should be enough.