How to get ACA certification

Hello, i was told i need to sign up with cms.gov but i am unsure how to do this correctly. It asks alot of things that i am not very familiar with. The job i did have before already had one for me to use that funneled the code to everyone from that 1 email used to login. Was wondering how to be put in the right direction so i can try to get a remote ACA job. This is for health insurance. Thank you!