Hi Pierre,
I hope I understand what you are trying to do.
To use the teleportation VR pawn in your FPS level, you need to swap the FirstPersonCharacter pawn with the MotionControllerPawn from the VR template.
After you have imported the VR template content, delete the FirstPersonCharacter pawn from your level, place a MotionControllerPawn (make sure it is flush to the floor like in the original VR template), set Auto Possess to Player 0.
In order for the teleportation to work, you need to place a navigation volume in your level. Drag in a Nav Mesh Bounds Volume and set it up (press P to show it) so it covers your floor properly.
That’s pretty much it.
Cheers,
Marco.