How Do I Teleport only 1 player?

This is a modified version of zomspi's script.

local part = workspace:WaitForChild("Part1") -- Directory of your part, usually script.Parent
local part2tp = workspace:WaitForChild("Part2") -- Directory of the part you want to teleport to
local NumOfPlayersTouching = 0 

part.Touched:Connect(function(otherPart)
    local Player = game.Players:GetPlayerFromCharacter(otherPart.Parent)
    if not Player then return end -- It was not a player that touched the part
    if NumOfPlayersTouching == 0 then
        Player.Character.HumanoidRootPart.CFrame = CFrame.new(part2tp.Position) * CFrame.new(0,1,0)
    end
    NumOfPlayersTouching += 1
end)

part.TouchEnded:Connect(function()
    NumOfPlayersTouching -= 1
end)

Ok I'm sorry if this is not correct because I haven't coded for a little while but I would assume something like this would work:

local part = part -- Directory of your part, usually script.Parent
local part2tp = part2tp -- Directory of the part you want to teleport
local value = value -- This is where you make a int value (or number value) called whatever you want and direct it here

part.Touched:Connect(function(plr)
if value.Value == 0 then
plr.Parent.HumanoidRootPart.CFrame = part + CFrame.new(0, 1, 0)
value.Value += 1
else
value.Value += 1
end

part.TouchEnded:Connect(function()
value.Value -= 1
end

See if this works.