Decent amount of assembly work for a little thing that really did not need to arrive as completelly disassembled pile of drilled boards.  Read the instructions carefully and check geometries, distances and hole locations of the parts.  When assembled, you get two pieces that fit together - somehow.  You have to puzzle it out from the photos.  The two assembled modules just rest on one another.  They dont securely attach together.  The overall result is spacious, but needs to be placed where it can't be accidentally bumped or slid around.   Maybe glue it togwther and glue it to the desk with foam strips?