If you use Notes 6 - install the client - and you will be prompted during the setup to setup pop and smtp accounts.
If you already have a Notes 6 client installed and setup - select File, Preferences, Client Reconfiguration Wizard - and you will be prompted to setup smtp and pop accounts.
If you are using Notes 5 - you will need to add pop and smtp accounts manually in the advanced settings in the personal addressbook.
Regards,
Rune Carlsen
http://www.dominozone.net