Prospective H-1B cap-subject petitioners or their representatives are required to use a myUSCIS online account to register each beneficiary electronically for the selection process and pay the associated $10 H-1B registration fee for each registration submitted on behalf of each beneficiary. Registrants will be able to create new accounts beginning at noon Eastern on Feb. 21.

https://www.uscis.gov/file-online/how-to-create-a-uscis-online-account