Simply use it as you would on any other piece of electronics when you have them open. Just connect the wrist strap to any grounded object, or the ground terminal in an outlet. Make sure you are sure that it is the ground and not a hot or neutral lug if you are using an outlet. It is the bottom prong in the US (round shaped).
That means the main kernel crashed. Did it restart when you pressed ok? It may be an annoying prank type virus that is just annoying but has no real effects on the system.