The National Center for Biotechnology Information (NCBI) of the U.S. National Library of Medicine (NLM) provides the My NCBI tool. My NCBI allows you to save records and searches, and customize your results display with filters and other options.
Once registered, the user name (here: member) appears in the upper right.
After registration and when an email address is updated, NCBI sends a confirmation email message to that address. Upon receipt, click the link in the email. Once an address is confirmed, automatic email updates of searches will be received and the username may be retrieved.