The bath itself is designed to sit on top of the ground. If the area you selected is exposed to high winds, you may wish to build soil up about an inch around the outside edge of the bath to ensure that wind cannot get under the bath. If the location you select is not level, you will need to remove dirt from the high side and fill in the lower side. When the location is approximately level, set the bath in place and fill with water. Do additional leveling if required. Note that one portion of the bath has a notch slightly deeper than any other portion. This is where excess water should overflow.
Once you are satisfied with the placement and leveling of the bath, connect the tubing to the faucet. You can hide the tubing by opening a slit in the ground with a shovel, and inserting the tubing into the slit, and then pressing the slit closed over the tubing.