Depending on your user privileges, some of these buttons may be missing from your settings menu.

Buttons on the Settings screen
Volume - set default volume levels
Network - wireless connection settings
Keyboard - MIDI channel and transposition
Customize Home - add and remove home buttons
Date and Time - time zone and Auto Daylight settings
Global - lock screen preferences
User Profile - change access PIN and menu background
Guided Setup - return to factory settings and step-by-step setup
Clear Schedule - clear automatic schedule but keep settings
Music - hear and select favored musical arrangement styles and instrumentation
Ringing - hear and select instrumentation for bell ringing
About - credits