I don't understand the problem.

You would need to go to http://email.nokia.com and setup the email accounts.
Then you just need to login to Nokia Messaging on the device and you're good to go.

I did not have to configure anything, just have to enter my email + password for different email accounts I want to use at http://email.nokia.com then it would automatically appear with emails when I sign-in to Nokia Messaging on the device.