How to make gamepass dropper button thing?

So I'm making a tycoon for about a week now and I want to make a game pass that lets you buy a special dropper or something special in general, but I don't have any idea on how to make it. And I've tried a lot of stuff but nothing. And also I'm using the zed's tycoon kit. So if anyone has any idea how to make it using zeds kit then I would need some help.