Rotate a hinge joint on its own

Hello everyone !

So I wish to simulate a bat hitting a ball falling from above , Therefore created in photoshop every part of the hitting motion and because animation in Unity is Collide-Less i figured I would use a game object that will suit on my animated bat and by using the Hinge Joint, that should do the trick.

Now my question to you guys is how in the world I make that Hinge Joint move by its own , or more specifically , by a script that will active by clicking ? I am pretty lost here.

Thank you for your help and may you have a good day.