Nokia Mail setup
On a Nokia Lumia device, if you are trying to add your existing Nokia Mail account, select Settings, then select email+accounts, then select add an account and finally select Nokia Mail (or other account if Nokia Mail is not on the list). Enter your complete email id and password to add your existing Nokia Mail account.
On most Nokia devices, you can pick Menu and then Mail icon and follow the instructions to setup Nokia Mail on your device, or in other cases you can add your existing Nokia Mail account to your phone manually by following these instructions:
For more information on how to use Nokia Mail powered by Yahoo!, go to http://help.yahoo.com/l/us/nokia/mail/ymail/index.html.
Nokia Chat setup
On a Nokia Asha or S40 device
On a Nokia Symbian device, you need to get the free Chat application.
Know which version of Symbian your device uses? You can get the Chat app by visiting the corresponding link from your phone.
Symbian ^3, Anna, Nokia Belle - http://store.ovi.com/content/75668
Symbian 5th Edition - http://store.ovi.com/content/75653
Symbian 3.1 and 3.2 - http://store.ovi.com/content/20855