cup holders

Hello all, I am newbie here. I have 2011 Corolla Auto Sedan. Could anyone please guide how can I remove the armrest/cup holder of the rear seat? It seems like there is a clip of some sort on the left side of this armrest but somehow not been able to remove it. Thanks for your help. :)

Adding cup holder LED's by: http://accentglowled.com/ Since drilling is required, I bought a spare cup holder trim piece from Toyota. I think it was $37. The light sizes are 2-3/4 & 2-5/8 for the center. I'll keep posting updated pictures as progress continues.

Has anyone attempted to remove their rear door panels? Is there any room for more speakers back there? How about the center console? How do you get the em brake boot off? And, A pillars... I want to plasti dip mine and prefer to remove them. Any tips?