I don't know. Maybe you should ask in Halo Forge Discussion instead of General Chat. They might be more helpful, considering the name.
Well, typically it involves spawning the sender node, then moving to whatever barrier you're trying to bypass (be it physical, elastic, or even some of the death barriers on Sandbox), and spawn the receiver node. Make sure that after you do this, you don't let go or touch the right trigger at all, and that you save immediately. When you re-open the map, you should be able to go through the teleporter and land outside, past whatever barrier you were stuck at. But this doesn't work in all instances: there are some cases where you'll spawn it through a wall or past a death barrier, and when you walk through the sender node you'll die instantly (so make sure that you save as a new map if you're not sure the barrier you're trying to get past will work). That answer your question?