Unscrew the retaining screws at the top of the handle holder. The screws may be Phillips or flathead. Some are hidden under plastic caps that must be pried off to access the screws.
Pop the plastic handle housing off the bag and pull the handle up from the side holders where the two arms compress into the side of the luggage.
Check the telescoping mechanisms for stickiness of any stuck rod blanks. Apply several dollops of the dry lubricant at the telescoping points on each side of the handle's rod blanks.
Compress the handle and open it several times to work the dry lube into the rod blanks. Feel that the mechanisms work with little to no friction, letting you know the problem is fixed and the bag is ready for use.
Screw the top back onto the luggage and push any screw caps back onto the suitcase.