How to open it
To open the hot tub:
Unhook the 4 rubber bands (2 in front, 2 in back)
Flip over the front half of the cover on top of the other half, se images below
Slide the folded cover off, over the back edge of the hot tub, supported by the frame of the gas spring
How to turn it on and fill it
Ensure that the lever is pushed all the way in before pushing the on/fill button
Push the on/fill button
How to empty it
Press the on/off button until you hear a subtle 'knock'. This is important, otherwise the hot tub will continue to fill itself, while simultaneously emptying itself
Pull the lever up. This releases the water
Wait for the hot tub to empty, but check on it every once in a while to ensure that it's not refilling itself