After adding services and resources, the final step is to tell Veribook when a particular resource is available for a particular service.
Put another way, working hours enable Veribook to display your real time availability. When customers view a particular resource's availability for a particular service, they will only see times that are a) within the working hours that are configured and b) not otherwise busy or blocked off.
This tutorial is for creating working hours for services designed for individual appointments and bookings. Instructions for setting when you're available for group services (e.g. classes, seminars, workshops) are available here.