To add email names user POP Mail box to your site.

Login to your control panel.

 Then Click --  "Edit Mail and FTP Users"

 There you will find the list of users..

Click in the link " Add a user to this server "  

 Fill out the 3 boxes under " Virtual domain user mailbox details"

You can leave the other setting at the default.

 Then "Create" ...

After the user is added look at the name listed under the "IMAP/FTP login" for the login ID for that account.  

Now the login listed / password you should be able to setup mail program like MS Outlook or Thunderbird .. Also that ID can be use with the webmail.

 Other options like forwarding a copy and auto replays can be edited or canged from that area.