Directions leave a lot to be desired but there are several tutorials (with photos) on the internet.  The foam rubber covers for the metal parts are total junk.  I went to Lowes and bought $7 of 1/2 inch pipe insulation, cut it to length and replaced the foam that came with the unit.  It was not difficult to put together but required some strength.  My 2 & 4 year old grandchildren love it.