How do i give player points to a player when the player enters the game?

-- declare service
local PointsService = Game:GetService("PointsService")

-- Bind function to player added event
game.Players.PlayerAdded:connect(function(player)
    -- Get total number of points the game has available
    local pointsToAward = PointsService:GetAwardablePoints()
    -- Get total number of points this game has already awarded to the player
    local universeBalance = PointsService:GetGamePointBalance(player.userId)
    -- Check if the game has points to award and if the player hasn't gotten any points yet. If both are true, then give the player a point.
    if ( pointsToAward > 0 and universeBalance == 0) then
        PointsService:AwardPoints(player.userId, 1)
    end
end)

-- Bind function to when points are successfully awarded
PointsService.PointsAwarded:connect(function(userId, userBalanceinUni, userBalance)
    -- Show message indicating that a player has gotten points
    local message = Instance.new('Message', game.Workspace)
    message.Text = "Point awarded to " .. userId .. ". This player now has " .. userBalance .. " points total!"
    wait(5)
    message:Destroy()
end)

I got the script and you can review more information about them here: http://wiki.roblox.com/index.php?title=Points_tutorial