Information said to email company not take problems to the retail.  I emailed the company and they said to have Wayfair to take care of the problem!  What a mess, 
took all day to put together.  Had wrong back support part.  Ended up with 5 packages of unused screws and cams.  The holes for the cams were incorrect on the wooden parts.  Finally got it together by drilling new holes and using my screws to fix.  The desk top is holding it together.  DO NOT PURCHASE !!!
Weak and cheap looking.