How do I change the nickname associated with my MLB.com account?
If you would like to change the nickname associated with your MLB.com account, click on "Edit Profile" after logging in through the "Welcome" button on the top right of most MLB.com pages. This will bring you to your MLB Account page.
In the MLB Account page that opens once you have logged section, click on the drop down link to the right of where it says "Nickname." In the window that opens, enter the new nickname you would like and then click "Save."