How do you add 1 + to a leaderstats?

I have a leaderboard script: `local dataStoreService = game:GetService("DataStoreService") --Service for DataStore

local cashDataStore = dataStoreService:GetDataStore("cashDataStore")--DataStore for Cash

game.Players.PlayerAdded:Connect(function(player)

local leaderstats = Instance.new("Folder",player)

leaderstats.Name = "leaderstats"

local cash = Instance.new("IntValue",leaderstats)

cash.Name = "Cash"

local data

local success,errormessage = pcall(function()

data = cashDataStore:GetAsync(player.UserId.."-Cash")

end)

if success then

cash.Value = data

else

print("There was an error while getting data")

warn(errormessage)

end

end)

game.Players.PlayerRemoving:Connect(function(player)

local success,errormessage = pcall(function()

cashDataStore:SetAsync(player.UserId.."-Cash",player.leaderstats.Cash.Value)

end)

if success then

print("Data successfully saved!")

else

print("There was an error when saving data!")

warn(errormessage)

end)` and i am trying to add 1+ value to cash after clicking a gui button.

The client can't modify leaderboard values as only the server can manage that. To solve this, use a RemoteEvent in the client to fire a function to the server when a player clicks a button.

-- Local script
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local Event = ReplicatedStorage:WaitForChild("RemoteEvent")

script.Parent.MouseButton1Click:Connect(function()
    Event:FireServer()
end)

Also on the server side of things, you need to first get the previous value of the stat, and then add 1 to it.

-- Server script
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local Players = game:GetService("Players")

local Event = Instance.new("RemoteEvent")
Event.Parent = ReplicatedStorage

Event.OnServerEvent:Connect(function(player)
    player.leaderstats.Gold.Value = plr.leaderstats.gold.Value + 1
end)