How to incorporate a datastore(1or2) in this script?

Hey everyone so i was wondering since im still new how can i put datastore (or datastore2) in this script:

game.Players.PlayerAdded:connect(function(player)
    local folder = Instance.new("Folder",player)
    folder.Name = "leaderstats"
    local currency1 = Instance.new("IntValue",folder)
    currency1.Name = "Cash"
    player.CharacterAdded:connect(function(character)
        character:WaitForChild("Humanoid").Died:connect(function()
            local tag = character.Humanoid:FindFirstChild("creator")
            if tag ~= nil then
                if tag.Value ~= nil then
                    local stats = tag.Value:WaitForChild("leaderstats")
                    stats["Cash"].Value = stats ["Cash"].Value + 20

                end
            end
        end)
    end)
end)

Idk how to make it work.