The screenshot that kmb shows is the default built into Ohme.
I just deleted them and created a new schedule to suit my Octopus cheap charging times.
My charging schedule is set between 12.30 pm and 5.30 am.
You will have to create your own according to your energy provider.
If I want to add a charge outwith these times, I just plug it in and pause the charge when I want to unplug it.