Using mecanum wheels programing in easyC

Okay so I am new to the whole mecanum thing on EasyC can some tell me how to program it step by step and have it so if I press the buttons on the left side of the controller they will move the robot with mecanum wheels sideways (im talking about the buttons on the left side mainly the left side one and the right side on out of the 4 on the left side. It would be much appreciated thaks ^^

A well defined EasyC tutorial can be found at the link above. Thanks Sam!