Instruction: Answer the given question using the supporting document.

Input:
Question: How do you adjust the height of this rack?
Document: ***I cut a piece of plywood to fit the bottom (laying it over the poles) so he's able to have a shelf for all his boots/shoes. I spray-painted the shelf black. Because you can adjust the height of the rack, it has plenty of room for an added home-made shelf! The shelf added a TON of storage. If he ever needs to collapse it, all he has to do is lift off the plywood shelf and fold it up!
I love the collapsible rack - it's heavy duty and not flimsy. I like the fact that it collapses and I can put it away when I'm not using it.
I absolutly love this clothes rack. It rolls very easy, even when it is full. It is by far the best clothes rack I have ever seen
I have used the rack several times at my in-home parties and it has worked very well. Easy to assemblr and can hold tons of clothes. Just wish it came with a carry case.
Rack did not sag and I found that I could use the lower frame for storage of additional totes. The product is well made and if the need arises, I would order again.
This rack holds well, does not tip and is easy to move with durable wheels.If you are going to keep a rack around for seasonal clothing you may want to go ahead and buy this heavy-duty one.We use it for Coats and Winter Clothing and Gear and it will last.
I love this rack!!!! I've had several racks and all of them have been crapy, not only is this rack sleek it also adds a nice decor to whatever room its in, but it carries a lot of weight. i have several winter coats and all my dresses on this rack and it is incredibly sturdy. great buy, worth the money
The rack arrived with the most important part missing from the box! The hangrail rod (the part the clothes hang from) wasn't in the box! The seller doesn't respond to emails (or) phone calls! Because it's Friday, now I have to wait until next week just to deal with this! Add another week for re-delivery of the missing part & I've had to wait 3 weeks for this rack! Buyer beware!
It folds down and is VERY easy to put together and it allows me to display my hand quilted items in a much more user friendly way.People actually come look at them now and better yet, buy them! It is quite sturdy. The only thing that would make it better would be if it had at least 2 locking wheels, but that is easily overcome for the convenience and quality of the rack otherwise. I'm a very happy person.
I read the reviews that others had written and decided that I would give this a try since I needed additional room to hang my clothes. The rack arrived ahead of schedule and in great shape. The box was custom designed for the product. It did have an instruction sheet which I just glanced at. Assembly was fast...  less than 5 minutes. I found the rack to be sturdy and can hold considerable weight.
Answer: It has a push button release on each upright that allows you to adjust to two different heights.  The photo shows the rack at the high position.  The low position is approx. 8" lower.