The k750 should work my friend has one and work with his 330cab
How are your contact saved on your phone? try saving them to your sim card so you have not got multiple entrys under one name as I think this confuses the car kit. Have you got the latest phone software?

As for where the sms screen is from memory is where you put the numbers in on the sat nav screen I will try and look tonight also take some pics which might help