I had the walmart bike in my cart, but there is no place to select frame size

the review says " I would estimate to be about a 49 cm frame, 52 max from the way it fits me. ......, a 5'9" 140 pound adult."

being 5'11" and 180 lbs, this would probably be too cramped for me. but i may be able to grab the wheels, stem and bars and give the other parts away for someone else to start a project with.