Help needed for communication between HC-12 modules 433MHz

I'm kindly asking for help with the HC-12 RF modules http://www.seeedstudio.com/wiki/images/b/b0/HC-12_User_Manual.pdf.
The thing is I don't get the modules to receive or transmit any data and i might need some help on that. What i managed to do is making a program that adjusts the settings of the modules in the "command mode". I hope some one is willing to help me with making the modules communicate with each other.

thanks....