Strap On Tank Bag How Do I Attach An Onori Guitar Strap To My Guitar? Can It Be Upside Down?

How do i attach an Onori guitar strap to my guitar? Can it be upside down? - strap on tank bag

The belt can be reversed? This is the L-1 Onori leather strap. I do not know how long to put the neck of the guitar - marked the end Lohr (in the skin) or lichens anchored narrow end.