I love the website P.S. I made this. The creator really inspires me to look around and see what can be repurposed. I learned to do the upholstery from Apartment Therapy and a few other websites.
It's pretty simple. I went out to Walmart to get a heavy duty staple gun, which is very handy for home and decoration projects, always good to have one handy. For the fabric, I went to Ikea and picked out a fabric that I liked for less than $10. The whole project probably cost me around $20 while a new chair would have been a few times that price, not to mention that it's probably not going to fit in the car and I'll have to get it delivered.
So I simply unscrew the parts, taking care not to lose any screws or small parts. One tip is to stick the screws on a piece of tape. Then I cut the fabric, ensuring it's big enough the cover the original fabric. The next step is to start stapling with the staple gun and make sure the plastic parts cover the edge of the fabric when I assemble it back. Lastly, simply screw the parts back together and there's a brand new customized chair!