The first thing I day was unscrew the top from the bottom, it was easy peasy. Don't forget your model! Pippi loves to model, too bad I took all of the pictures on my phone.
Then I got very analytical by laying the bench on top of the material, the material was face down on the floor. Don't forget the cat to hold it down for you! Then you just cut the material, leaving enough room to fold it over the bench. Hard, huh?
I folded over the short ends first, stretching it tight. Next, fold over the long ends. I used my thumb to push in the corner when folding that piece over, see the picture. Otherwise you will have a little bump at the corner.
I used a staple gun to staple down the fabric. Before stapling the whole long side, check where your screw holes are and mark them with a pen. After you finish stapling the long sides, poke the screw holes.