There is no such thing as a stupid question, but there are people too stupid to ask a question.
Your dealer should have explained to you that all you need to do is plug in the car (a totally drained battery will take about 10 hours @120 volts and about 2 1/2 to 3 hours @ 240 volts (I could be off on the time, I use a 240 volt level 2 charger and it seems to take a little more than 2 hours but it is rare for me to go below 25% charge)
Some of the following goes against factory recondimations
I just leave the button set to EV. The car will run on battery power until the battery goes down to 2 bars (the computer holds two bars in reserve in case you need extra help to climb a mountain, don't forget the Clarity ICE is smaller than some motorcycle engines so that is why always holds some battery in reserves case you need help getting up a mountain ) Contrary to what some people have written on the forum if you leave the car in EV mode the computer will automatically run the gas engine so there is no need to run the engine (ICE) yourself (it is referred to ICE for internal combustion engine) It does this automatically to make sure the oil keeps the engine lubricated.
You can charge the engine while driving (up to 78%)but in my opinion it is inefficient to use the ICE to charge the battery. If you insist on doing it all you have to do is press and hold the HV button.
Since I usually get 58 tp 62 miles on a charge and I normally do not go further than 40 miles I never use gas
I have over 2,000 on my car and I thought the gas gauge may not be working because it has not moved since I got the car. I pulled into a gas station for a fill up and to check the gauge was working. it was only ably to take 0.4 gallons which meant to me the gauge was fine and the 0.4 of a gallon that was used was to keep the ICE lubricated. To sum it up leave it set to EV and forget about it the computer will handle everything.
I hope I explained this in a easy to understand manner and you understood my explanation.