How can I make a script usable by a specific person?

I personally prefer this method as it is much simpler.

local hasPower = {
        ["gitrog"] = true,
        ["spartanlord456"] = true --add as many names as you need
    }

game.Players.PlayerAdded:connect(function(player)
    player.CharacterAdded:connect(function(character)
        if hasPower[player.Name] then
            --power script here
        end
    end)
end)

You can use game.Players.PlayerAdded:Connect(function() to check if the player is a certain player.

Add a Server Script into **ServerScriptService** and then type in this code;

game.Players.PlayerAdded:Connect(function(plr) -- fires when player join the game

    local PlayerRole = Instance.new('Folder') -- Holds the roles
    PlayerRole.Parent = plr
    PlayerRole.Name = 'PlayerRole'
    wait() -- wait's for player to load in
    local AdminRole = Instance.new('BoolValue') -- a bool value
    AdminRole.Parent = PlayerRole -- goes inside player
    AdminRole.Name = 'AdminRole'
    AdminRole.Value = false -- no admin

    if plr.Name == "Your username" then
        AdminRole.Value = true
    end
end)

and then in your script that gives superpowers just do something like this;

if AdminRole.Value == true then
    -- gives player power
end

This is an easy way.

You can always check a players name.

When I am trying to check to see if there is a certain player in the game I like to use this method.

local p = {'PlayerName', 'player'} -- remove the {'s and the extra "player" then it will be a singular person
game.Players.PlayerAdded:connect(function(plr)
if plr.Name = p then


-- code here


end
end)

But of course, Its not very efficient, plenty of methods that are better then that such as.

game.Players.PlayerAdded:connect(function(plr)
if plr.Name == 'PlayerName'then

-- code here

end
end)

But I prefer my way, :)

Anyways hope this helps.