How can i save leaderboard? Plz Answer.

Hello I created a script with SaveNumber() And LoadNumber()

In server I was testing it. I wrote:

game.Players.vincius0000:SaveNumber("VincTesting", 5)

Then I wrote.

print(game.Players.vincius0000:LoadNumber("VincTesting"))

And it printed number 5. But I need it to work with leaderboard. I don't know how can I save and load my leaderboard. I tried loading with

game.Players.vincius0000.leaderstats.KOs.Value = LoadNumber("VincTesting")

I tried everything that I know. And I know that there is simple mistake. Plz Help Me Find It.