When you ask for help, please do what is printed in red at the top of the Create New Discussion page: To wit; Note: If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. In this case, we don't know what e-mail client you are using (Outlook, Outlook Ecpress, Eudora, Thunderbird, etc.), we can only guess at an answer
The previous post tells you where to find what you want in Outlook Express. If you are using Outlook, the procedure is the same. However, if you are using some other client, the path may be different; we need to know what program you are using so that someone familiar with that client can tell you where to find the server names.
To answer your other implied question, these are simply the names of the computers (servers) on the Internet that handle your mail traffic; one for your outgoing mail and one for your incoming mail.