How to remove old leaderboard?

I wish to make my own leaderboard kinda like this:
[Sorry for the blurry image]

But I first need to know, how do I turn off the leaderboard that already exists?
And how would I go about replacing the old one with a new one?

I am sure this can help

local StarterGui = game:GetService("StarterGui")
StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.PlayerList, false)

To make a custom leaderboard: