When you sign into Elements you will see an option to connect your Elements account to ORCiD:
You will be redirected to ORCiD to register or sign in.
Elements will read your ORCiD record and add publications you have claimed (or will claim in future) in ORCiD to your Elements profile if it can find a DOI match in its system. This means ORCiD can auto-populate your Elements profile with any articles. This will cut down on some of the manual burden of keeping your Elements profile up to date.