This is the line - go to US Imnmigration website and complete Form N-400 on that website. That puts you “in line”. Follow their directions for the next steps to take. See below:
Prepare Your U.S. Citizenship
Application Online!
Use our step-by-step guide to complete your Form N-400, US Citizenship Application online. Our easy to use form guide will provide you with everything you need to file your application with U.S. Citizenship and Immigration Services (formerly known as the INS).
Is that form for folks already in the US illegally?