Why can't I change a variable from a different script?

I tried making a currency and a minigame and what is supposed to happen is that if you get first, you would get that currency, but it never works.

local w = game.ServerScriptService.v:FindFirstChild(Wins)
local p = 0
if workspace.Parkour.PWalls.Winplat.Touched:Connect(FindFirstChild("Humanoid")) and p < 1 then
 w = w + 1
 p = p + 1
else
	p = p + 1
end

If anyone could help me, that would be great.

Access the value, not the int itself. When using FindFirstChild the correct syntax is (" "), since you're searching for a name.

local w = game.ServerScriptService.v:FindFirstChild("Wins")
local p = 0
if workspace.Parkour.PWalls.Winplat.Touched:Connect(FindFirstChild("Humanoid")) and p < 1 then
	w.Value = w.Value + 1
	p = p + 1
else
p = p + 1
end

I think this is what you want though, the if statement will only run once, if you put it into a touched function it will watch for the touch.

local w = game.ServerScriptService.v:FindFirstChild("Wins")
local t = FindFirstChild("Humanoid")
local p = 0

workspace.Parkour.PWalls.Winplat.Touched:Connect(function(t)
	if p < 1 then
		w.Value = w.Value + 1
		p = p + 1
	else
		p = p + 1
	end
end)