simple username whitelist

local whitelist = {
    "username",
    "username",
    "username",
    "username",
    "username",
    "username"
}

local playerName = game.Players.LocalPlayer.Name

local function isWhitelisted(name)
    for _, whitelistedName in ipairs(whitelist) do
        if name == whitelistedName then
            return true
        end
    end
    return false
end

if isWhitelisted(playerName) then
    print("hi") -- replace with your script, prefably a loadstring
end