To add you opening and closing times go to the 'Online Tool' tab in the Settings area.
On the panel for the opening times you have a few options;
Firstly you can set weather or not allow customers to select preferred drop off and pick times on the online booking tool. The customer can choose their time from a drop-down list (times are incremented in 15 minute intervals - this can be customised).
You can give the customer the option of enter a time outside of standard opening/closing times.
You can also make them choose a time for the pick-up and drop-off.
Next up you can choose to mark particular days that you close for drop-offs and pick-ups.
And finally you can set two opening periods per day, from the example below the kennel opens from 10am to 12pm and 6pm to 7pm Monday to Friday, and opens only between 10am and 12pm on Saturdays, and is closed on Sundays.
When setting your opening and closing times, you may have accidentally set the incorrect opening/closing meridian on the time, eg AM instead of PM. If you have multiple opening and closing times it's pretty easy to add in the incorrect time accidentally.
Times not appearing for Daycare or Training bookings, while you may have added in your opening and closing times for there is an additional option on the Daycare Settings screen and the Training Settings screen that can cause the time selectors to not appear on the online system.