This article provides some instructions on how to change the settings of Yealink W52 phones. Topics include:

Language
Ring Tones
Advisory Tones
Backlight
Screen Saver
Color Schemes
Keypad Light
Notification Light
Date and Time
Shortcuts
Contact Management
Call History Management
Speed Dial
Auto Answer
Base Restart
Eco Mode
Repeater Mode

For more information, please refer to the following articles: