Turn off the water supply to the HOT-1 dispenser at the supply valve under the sink between the dispenser holding tank and the house line. Unplug the dispenser power cord under the sink.
Pull off the remaining piece of the old lever from the cover. It might be necessary to use a pair of needle-nose pliers to pull off the remaining lever. If there is not enough lever left to grab with the pliers, pry off the remaining piece with a small flat-head screwdriver.
Position the new lever into the slot on the rear of the cover. The wide part should be pointing up and the end with the slot pointing to the faucet.
Push the lever into the cover until it snaps into place. Push the lever down and release it several times to ensure it springs back up when you depress it.
Turn the water supply back on and plug the dispenser power cord back in.