Hello and welcome to Just Answer !

I found this on a user review and it sounds like a good way to do it.

1. Fold the feet up into the legs by pressing the silver button down by the hinge of each foot.
2. Press the button on the handle to collapse it down, but do not push it all the way down. If you do collapse it all the way down, the button will pop up. Push the button down and the handle will pop up a little.
3. With the name and logo facing you, pull the handle towards you so that it pops out of the frame and comes toward you. (The cart is locked in position if the handle was pushed all the way down, so the top button must be pressed to loosen the handle).
4. The wheels will fold inward and the handle will pivot down between the legs.
5. With the feet in the frame, they will tuck in under the shell at the top and fit in the notches of the handle on the bottom.
6. Push the handle down to lock the carrier in the closed position and stretch the bungee cords around the cart.