Wiring a button for a solenoid on a T-shirt launcher HELP!

[panther83]

I am with a pre-rookie team from Washington Illinois and our first robot is a T-shirt launcher bot. We have the standard electrical board with 4 talon controllers going to 4 motors. All is controlled by an Arduino with Robot Shield, hooked up to a digital sidecar. Our problem is that we need a way to hook up a solenoid to our power distributor but also have a button wired into the PWM ports of the sidecar to distribute 12V of power to solenoid valve when pressed. I have no idea what to do but I do know how to solder, any help is awesome!