All new players start as NR until a match is entered.  Then you will have the ability to self rank after your first match is entered.

Players can self-rank their skill level based on the general characteristics provided or you can be ranked by an AMR Master (find one here)

An AMR Master can give you an official rank and you’ll earn a Chinese Star Anise by your name.  Others will know the authenticity of your ranking.

Your ranking updates automatically every time a match is entered.  Rankings are dynamic, meaning they can be adjusted based on match results and player performance.