How to combine these two scripts?

This should teleport a certain amount of players before you want the game to stop teleporting players. Also, the :MoveTo() method you used is depreciated so I used the non deprecated way of doing it. I was just assuming from your code that this is what you wanted to do, if you want the script to do anything else, please say so.

local teleportTo = game.Workspace.Part --What part you teleport to. Change this to whatever part you want to teleport to. 
local numTeleportedPlayers = 0
local canTeleport = true --boolean for if more players can / cannot be teleported
PLAYERS_TELEPORTED_LIMIT = 2; -- specify the max number of players that can be teleported here

function OnTouched(part)
    -- part.Parent:MoveTo(teleportTo.Position)
    --^^^^ is deprecated, use the below:

    if(part.Parent:FindFirstChild("HumanoidRootPart")and canTeleport == true)then
        part.Parent.HumanoidRootPart.CFrame = CFrame.new(teleportTo.Position)
    end
    numTeleportedPlayers = numTeleportedPlayers + 1
end

if numTeleportedPlayers > PLAYERS_TELEPORTED_LIMIT then
    canTeleport = false 
    wait(10) canteleport = true 
end

script.Parent.Touched:connect(OnTouched)

The script currently only checks if the number of players does teleported is too high, it does not check if the player uses the teleporter twice, but it can.

just change 'numTeleportedPlayers' to "teleportedPlayers = {}" and whenever a player teleports, add them to the table by using:

table.insert(teleportedPlayers, part.Parent.Name)

see if the player trying to be teleported has already teleported by adding a check to the following line:

if(part.Parent:FindFirstChild("HumanoidRootPart") and canTeleport == true and not teleportingPlayers[part.Parent.Name])then

Put this script in ServerScriptService and change the "" in PART to the part's name.

cantp = true
limit = 5
current = 0
teleto = game.Workspace.oturak
PART = game.Workspace["Your Part's name / Part the player must touch(must be in workspace)"]

game.Players.PlayerAdded:Connect(function(plr)
    PART.Touched:Connect(function(part)
        if part.Parent.Name == plr.Name then
            if current <= limit then
                if cantp then
                    part.Parent.HumanoidRootPart.CFrame = teleto.CFrame + Vector3.new(0, 4, 0)
                    current = current + 1
                    cantp = false
                    wait(0.1)
                    cantp = true
                else
                    print("Not yet")
                end
            end
        end
    end)
end)