If the installation process was successful, you can visit
Appearance> Widgets and you should see Advanced Business Hours in the Available Widgets area.
If your theme supports widgets, you can drag and drop the widget to the desired widget area (ex: sidebar) and then configure the plugin.
If your theme doesn't support widgets, drag and drop the widget to Inactive Widgets area and configure the plugin.
Simply drag and drop the widget in one of the above areas, you should see the widget with general settings tab opened as default.
Drag and drop the widget to sidebar or inactive widgets area to configure. In the next chapter, we are going to see how to configure the plugin.