How do i take apart the armrest on my captains chair

Question edited for clarity.
Question moved from Spanish car company Seat (pronounced See-At).

It seems to be a known issue

https://www.google.com/search?q=2013+GMC+Yukon.+My+drivers+side+2nd+Row+Captains+chairs+seat+is+stuck

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If you have third row. Look at the slots in the floor. If the outer slots are the same distance apart, front and back, then you can. Some vans you can, but some the captains chair are spaced further apart.

Great to here.

You have 2 lever (handles) 1 located in the back side of the chair, thats the one you have to work on.

should be 4-6 big bolts under the chair. In most cases with that year, GM put a star shaped screw in them and sometimes takes an uncommon screw bit. Hopefully not.

The real real answer. If the threaded stud is in the armrest there is a clip at the bottom of it you have to push it up and pull the stud out with vice grips twisting as you pull out. If both the studs are in the chair you have to make sure the clip is pushed up & out of the way then simply line up the arm rest and push it on. It should clip into place. Hope that is clear enough. Also I would put some Lock Tight on the threads. (Blue)

If it's similar to those in past, you don't remove the stud, you have to push it back in at certain angle & rotate it, to lock it back in. Something tells me it's at about 2 o'clock, in push hard and turn down to rest position? I know I've had to play with some before getting it to go as it's supposed to. If worst comes to worst, stop at a body shop, it will take them about 2 minutes in most cases.

PUSH ON THE LENSE ITSELF.

to tighten the NUT that holds the armrest on the 2nd row captains chair first undo the seat cover plastic snap together on the bottom of the back of the seat, then remove the phillips head screws that hold the plastic seat back under the corpet back, to do this i just poked the screwdriver thru the carpet, you can feel where they are, as a not leave the seat folded down so the screws dont fall ouy of their holes. now with a skinny arm reach under the plastic and work your hand to the nut and tighten it up as good as u can, unfortunatley i dont remember the nut size but you will need a boxend ratchet or a ratchet with a long extension and a swivel or perhaps the screwdriver handle driver and tighten it up. hopefully if it came all the way out you can find the nut, its at least an 11/16. it wouldnt hurt to put locktite on the threads if its all the way out. hope his helps