This is a local script that will work when I test in studio mode, but won't when I play from the roblox website.

The whole script is:

lp=game.Players.LocalPlayer
gui=lp.PlayerGui
frame=gui.Welcome.Frame
submit=frame.submit
value=frame.value
stat=frame.stat
player=frame.player
reset=frame.reset

admins={
	["XtremeSpy"]=workspace.ec.Value,
	["Frostari"]=workspace.fs.Value
}
groupid=1051893
function isPlayerAdmin(p)
	for i,v in pairs(admins) do
		if p.userId==v then
			return true
		elseif p:IsInGroup(groupid) and p:GetRankInGroup(groupid) > 11 then
			return true
		end
	end
end

function checkStat(static)
	types={"Kills";"Deaths";"Points";"Demerits";"Promotion"}
	local check=static:lower()
	for i,v in pairs(types) do
		print(v)
		print(v:lower():sub(1,check:len()))
		if v:lower():sub(1,check:len())==check then
			return v
		end
	end
end

function getP(name)
    local p1 = name:lower()
	for i,v in pairs(game.Players:GetPlayers()) do
    	if string.sub(v.Name,1, p1:len()):lower() == p1 then
    		return v
    	end
	end
end

submit.MouseButton1Down:connect(function()
	if isPlayerAdmin(game.Players.LocalPlayer) == true then
		if string.len(value.Text) > 0 and string.len(stat.Text) > 0 and string.len(player.Text) > 0 then
			if tonumber(value.Text) ~= nil and checkStat(stat.Text)~="Promotion" and getP(player.Text)~=nil then
				local vlu=tonumber(value.Text:match("%d+"))
				local sts=checkStat(stat.Text)
				local plyr=getP(player.Text)
				plyr.leaderstats[sts].Value=vlu
			elseif tonumber(value.Text)==nil and checkStat(stat.Text)=="Promotion" and getP(player.Text)~= nil then
				if value.Text:lower()=="yes" then
					local vlu="Yes"
					local sts="Promotion"
					local plyr=getP(player.Text)
					plyr.leaderstats[sts].Value=vlu
				elseif value.Text:lower()=="no" then
					local vlu="No"
					local sts="Promotion"
					local plyr=getP(player.Text)
					plyr.leaderstats[sts].Value=vlu
				end
			end
		end
	value.Text="< Value >"
	stat.Text="< Stat >"
	player.Text="< Player >"
	end
end)

reset.MouseButton1Down:connect(function()
	for i,v in pairs(game.Players:GetPlayers()) do
		for k,val in pairs(v.leaderstats:GetChildren()) do
			if val:IsA("IntValue") then
				val.Value=0
			elseif val:IsA("StringValue") and val.Name=="Promotion" then
				val.Value="No"
			end
		end
	end
end)

But the only part that doesn't work is the, reset.MouseButton1Down:connect, on