You can adjust all watch settings directly in the watch.
To adjust a setting:
Scroll through the settings menu by swiping up/down or turning the crown.
Select a setting by tapping the setting name or pressing the crown when the setting is highlighted. Go back in the menu by swiping right, pressing the lower button or selecting Back.
For settings with just two values, such as on or off, change the value by tapping the setting or by pressing the crown.