I will be following another reviewers tip and securing each shelf with 4 zip ties

Top shelf is taller then others

I could get two shelf's on, but when I put third shelf on it would fall apart.

I keep my cats food on the top shelf and various other pet things on the bottom shelves

Do the bottom shelf first--hook the little stubs over the top of the side piece, and raise the sides of the shelf enough to get them above the middle wire and underneath the top of the three wires on the side piece

Works for what’s I wanted, however was extremely difficult to line up the pieces alone.