how to make it so only one team can click a block and it teleports?

You would need to do something similar to:

local part = script.Parent -- Defining the part the player clicks on
local clickDetector = Instance.new("ClickDetector", part) -- Creating a ClickDetector inside the part
local teleportToPosition = CFrame.new(10,1,1) -- Where the character teleport to

clickDetector.MouseClick:connect(function(player) -- When player clicks the part
    if player.TeamColor == BrickColor.new("Really red") then -- Change "Really red" to the BrickColor value of the team you want to be able to teleport 
        player.Character.HumanoidRootPart.CFrame = teleportToPosition -- Teleports player
    end
end)

This script will check what team a player is on when they press the button and teleport that player if they are on the right team.

Hope this helps.