After selecting the Location tab in the Settings page, select the location you want to edit and click the "Edit" button.

Scroll to the Business Hours section of the location edit page and use the drop down menus to select the opening and closing times for the location. For days when your business location is closed, simply check off the "Closed" box under the corresponding days.

Don't forget to click the "Save" button at the bottom of the page to confirm your changes.