Remove hex key attached to one of the four legs, set aside.
Insert legs into lower bases and upper side rails.
Note that the four legs are identical and interchangeable. They will fit correctly on any side of the outside dog bed.
Use hex key to tighten legs.
Note that if the Lounger tips due to an unlevel porch, this issue can be resolved by loosening one or more legs, readjusting leg height, and re-tightening the set screw. The best outdoor dog bed should work for every porch.