I try to make a scoreboard that works, but whenever the player scores a goal, it doesnt go up 1?

So me, and a couple of people are making a hockey game. We have a built in gui already. The puck, or the ball when thrown into the net, plays the audio we want it to play. But it doesn't add a goal to the scoreboard. For example changing "0" to "1" whenever they score a single goal. Is there something I have to do to make this work?