First of all, start Apple Mail. The Account Wizard will then appear if you didn't yet setup your mail account. Otherwise, you can start it from the Menubar: "File" > "Add Account...". From there on, follow the video below. Replace full name, username, password and email address accordingly. All settings are available in plain text on the page "Email/MailClient".
To be able to watch the movie, you need the quick time plugin.