First go to the biggest tower and then go to the room under it.

There will be a diamond shaped thing that's black and kinda a greenish bluish color on the ceiling.

Then spawn a receiver node and put it upside down on the ceiling.

Hold it in place, then while you're holding it save the map as a new map (doesn't work if you just start a new round).

Then go back into forge and go to the receiver node and spawn a sender node and put it right under the receiver node.

Then run into it. If it doesn't work then stand in the center of the two nodes and jump.