Advanced Referee
For Referee Certification Requirements of the various Grades visit the US Soccer website.

Referee Registration and Recertification

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All officials, instructors, assignors and assessors must register with U.S. Soccer annually to be eligible to work affiliated competitions and participate in the U.S. Soccer Federation Referee Program.
The Referee Registration window opens on July 1st each year and closes on June 30th of the following year. The registration is then valid from January 1st through December 31st of the following year. First time referees that register after July 1st can referee immediately after completion of certification until December 31st of the following calendar year. All other referees that complete the registration and re-certification process are valid only from January 1 to December 31 of the following calendar year.  Re-certification generally opens in November for the next calendar year.
2020 Registration is now open.
Here is the basic info including a link to step-by-step instructions-