By key you mean F2 or F3?
So you must be able to get to the spot.
I am trying to get to spot I can't get to.
What key to you use to start it after you have set it up as you describe?
This is simple when you take the time to read and understand the README tab on the trainer.
# Position
F2: Capture XYZ Position
F3: Teleport to XYZ Position
This is made to remember what position you're in with F2, then you can walk away and come back with F3.
And no you cannot choose a place you never been.
Hope it's going to be easy now 😎