The switch should be connected to pin 7 and ground. But the switch should be normally open, such that it is not grounded. When you push the button momentarily it should be grounded.
Pin 7 is the pin that, when grounded, will actuate a flip/flip. It should be normally open by going through a pushbutton switch that is normally open. The other side of that switch should be grounded. That ground can be any local ground, or, for your convenience, you can also connect the ground side of that switch to pin 3 (which is ground). Then, when you push the flip/flop switch, you'll momentarily connect complete circuit to ground (whether ground is pin 3 or some other local ground).