Push button with Sensor Sheld

Hello, I am trying to program a 6 axis robotic arm I am making, but I want to start the program with a push button. Problem is, I need to use a sensor shield to control the servos and I am not sure how to wire and program a push button on a sensor shield. I have an Arduino uno and an Arduino Sensor Shield V5. Thanks to anyone willing to help.

Problem is, I need to use a sensor shield to control the servos

Why do you think you need to use a sensor shield to control servos? Which sensor shield are you talking about?