To became a member of ICOFOM, first you have to became a member of ICOM. Afterward you have to advise ICOM that you want to became a member of ICOFOM, and to complete this application form you will find in the ICOM website:

https://icom.museum/en/get-involved/become-a-member/

https://icom.museum/en/

Welcome to the ICOFOM family!