I hope I can help. First, put some holes in the tub using a drill or a soldering iron. A soldering iron is preferred because a drill can sometimes crack the tub. Start off with just a few holes, maybe one every two inches on each side, you can always add more later. Use the foil tape to secure the Flexwatt to the bottom of the tub. Pick a side so the Flexwatt is not in the middle as your snake would appreciate warm and cool sides. Plug the Flexwatt into the Johnson thermostat, then the thermostat into an outlet. Place the probe of the Johnson in your tub. You can either put the probe through a hole, or drape it over the side. However if you drape it over the side, it might rub against the lid and eventually wear a hole in it. It's up to you as to where you want to put the probe, either in a hide, on the bottom of the tub under the substrate, etc. After you get it set up, set the thermostat and take temperature readings to make sure your temps are where you want them (80-82 cool, 90-92 warm).

Place snake in cage.

Close lid.

Enjoy.