These forms and instructions are available in the General Clerk's Office, Room 108, in the Nassau County. Marriage license applications may be filled out and saved online.However, applicants must appear in person to sign and purchase the marriage license. You (and any eligible children applying for K-4 visas) must: (1) complete Form DS-160 and (2) print the DS-160 confirmation page to bring to your intervew. An alphabetical-by-topic list is provided below containing information and downloadable PDF forms, when available, or links to external resources. Search all USCIS forms. File your form online for a more convenient and secure experience. Translation services and arrangements are available upon request. How to Apply for a Membership. 1. This guide includes forms and instructions for a letter and affidavit to request that the court register an outofstate custody order in Texas.