$ gpg --edit-key <key-id> gpg> adduid Real Name: <name> Email address: <email> Comment: <comment or Return to none> Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? O Enter passphrase: <password> gpg> uid <uid> gpg> trust Your decision? 5 Do you really want to set this key to ultimate trust? (y/N) y gpg> save $ gpg --send-keys <key-id>
Ref:
https://superuser.com/questions/293184/one-gnupg-pgp-key-pair-two-emails