A minimum of two teleporters are required to use them properly. In the menu of one of the teleporters, "Change teleporter target" must be clicked. Then, click another teleporter. On the second teleporter, you can either change the target to the first teleporter, or connect it to another teleporter.
Generally, teleporters will teleport to the target teleporter. Once a teleporter has been targeted by another teleporter, they will light up.
Teleporters can not be placed on paths, therefore currently preventing visitors from using them. Only players can use teleporters.