Once you have signed in to My NCBI, you can assign others as delegates, giving them permission to edit your My Bibliography and SciENcv profiles.
To add a delegate, go to your NCBI Account Settings page by clicking on your username in the top right corner of the page. You will see a section for managing your delegates. Click Add a Delegate to enter the email address of the person you would like to give access to. Once they have accepted the delegate role for your account, you can assign them access to your My Bibliography and/or your SciENcv profiles.
To create a My NCBI account, go to PubMed and click the "Log in" link in the top right corner. You will see many options for signing in to My NCBI including ORCID, Login.gov and ERA
If you choose to create a new NCBI account, you can link it to your eRA Commons account at a later time, which will be needed for managing NIH Public Access Policy compliance.