For all POP and IMAP accounts, you can change a variety of different settings, including your name, server settings, your default reply-to email address, and sent item settings.
In Outlook, choose File > Account Settings > Account Settings.

Select the email account you want to change, and then choose Change.

You can change any of the information on the POP and IMAP Account settings page, including name, email address, and password.
Choose More Settings > Advanced to change other settings, such as the default ports used to send and receive mail, server timeouts, and sent and deleted items options.