How to make a tool activated teleport?

Im a beginner scripter and im trying to make a teleport, a game to game teleport. A problem i have come to notice is i want it to be activated when you have a specific tool in hand/clicked(?) tl;dr: know how to make a game-to-game teleport, i just dont know how to make it activated when clicked by a tool in hand. I already have the tool ready, i just.. have no idea what kind of script id need in order to make it do what im wanting it to do.

If anyone could tell me how i could turn this script into what i may be searching for, that was be amazing! Or if anyone has a tutorial!! Im really sorry if this is a dumb question, i usually have ideas i dont know how to make.. Thank you so much for any responses!! :)

(the teleport script i am using is from this video! xxx)