Printing, assembling and mailing your package

Once your package is built, you print it, sign it, and mail it. USCIS filing tips: print on plain white paper, single-sided, in black ink; do not staple over the signatures; keep a full copy for yourself. The mailing address (a USCIS "lockbox") depends on the applicant’s U.S. state — your Package screen shows the exact address from the official USCIS page. Send it with a tracked service (USPS or a courier) so you have proof of the filing date, which must be on or before your Admit Until date.