Yes, the iCamSource does have to be running for the Send Push Notification and Record Motion Events settings to be changed at the scheduled times.
If you would like the two settings turned on between 6 pm and 11 am I would suggest having the following two schedule items:
Every Day - 18:00 - ON - ON
Every Day - 11:00 - OFF - OFF
You do not specify a range or a period of time, it's more of a "at this time, set the two settings to *this*"
So at 6 pm every day the two options will be turned on, and at 11 am every day they will be turned off.