From the watchface, press the lower button to get access to all of the watch settings via the Control panel .
The settings menu can be accessed directly if you long press the crown while you are in the watch face view.
If you want quick access to certain settings and/or features, you can customize the top and lower button logic (from watchface view) and create shortcuts to your most useful settings/features.
Navigate to the Control panel and select Customize followed by Top shortcut or Bottom shortcut and select what function the top and bottom button will have when long pressed.