You can print PMRF online and fill-up details. Then go to nearest Philhealth office. Bring other requirements like PSA birth certificate and other valid IDs.
https://haveyouuumetme.blogspot.com/2022/06/maternity-benefits-every-soon-to-be.html?m=1
pwede ka po magparegister .punta lang sa malapit na philhealth building at magbayad kalang po ng 2400 whole year na po yan...