To register an establishment on the EPFO website, visit http://www.epfindia.gov.in and click the "Employer e-SEWA" link. Select the state and EPFO office location of the establishment, then provide registration details including establishment name, address, authorized signatory name and mobile number to receive an OTP. Enter the OTP to create a temporary user ID and password, then use those credentials to login and create a permanent user ID and password for accessing employer services.