Adding a teleporter pair doesnt automatically add the teleporter shield. That oyu have to add on your own. Also, you must have it on the ground and the arrow has to bassically point where you are touching/going through.
Yeah I probably have the port pairs messed up and I did add the shield myself. But I want a two-way port pair. If I can't have that then I guess I could make yet another pair of portals and set them the opposite way. Anyways... I still don't kow why I am not getting the ports to work...