Am using a voice box shield.but i don't know how to code .i got some sample codes.but which controller should i select while uploading.can anyone help me with this?how to use this shield?

The page at Sparkfun should have enough information, VoiceBox Shield - DEV-09799 - SparkFun Electronics
It has links to code, youtube movie, schematics, and so on.

Which Arduino board are you using ?
What is the problem with the example code ?

I tried this link http://www.sparkfun.com/tutorials/166.but nothing works.it just says ready and when i enter my text through serial,its not working.Can anyone one help me?Is there anything wrong with the code posted in that site