Need help to update the sender mail configuration

Hi All ,

          iam trying to configure the SMTP mail server for sending mail for the alerts.

when i try to do setup as TLS authentication . it is showing to update the username and password for the email sending. can you please help how to update the same in the opensearch windows.
Below are the error which i see in the sending mail configuration

javax.mail.MessagingException: Could not connect to SMTP host:, port: 25, response: 554

SSL or TLS is recommended for security. SSL and TLS requires validation by adding the following fields to the Opensearch keystore: