How to take a variable out of my first script and put it through my second script?

game.Players.PlayerAdded:connect(function(plr) 
	
	local stats = Instance.new("IntValue")
	stats.Name = "leaderstats"
	stats.Parent = plr
	
    local clicks = Instance.new("IntValue", stats)
	clicks.Name = "Clicks"
	clicks.Value = 0
	clicks.Parent = stats
	
	local level = Instance.new("IntValue", stats)
	level.Name = "Rank"
	level.Value = 0
	level.Parent = stats
	
end)

first script

function onClick()
	--where I want to put my variable
end
script.Parent.MouseClick:connect(onClick)

second script . . I'm trying to make a clickable object thaat when you click it, the variable "clicks" goes up

When you use the MouseClick event, you can insert a parameter that tells you who clicked the object. In your onClick function we can insert a variable called "player" into the parentheses.

function onClick(player)
    --where I want to put my variable
end
script.Parent.MouseClick:connect(onClick)

Now whenever the object is clicked the player who clicked it will be stored in the variable "player".

Since you have added a value (clicks value) into the player directly from the server, we can access that value without a wall blocking us. Since we already have the player who clicked the object, we can just change their clicks variable in the function.

function onClick(player)
    player.leaderstats.clicks.Value = player.leaderstats.clicks.Value + 1
end
script.Parent.MouseClick:connect(onClick)

(you can make clicks into a variable if you want) This should work! :D

MouseClick returns the player who clicked.

function onClick(player)
	if player.leaderstats:FindFirstChild("Clicks") then 
		local ClicksValue = player.leaderstats:FindFirstChild("Clicks").Value
		ClicksValue = ClicksValue + 1 -- you can change the amount it adds
	end
end
script.Parent.MouseClick:connect(onClick)