It doesn't look like they still do a manual for that module (343 was the module number). I found these pointers on watchuseek
Pull the crown out one click. The LCD will blink.
Depending on what was initially displayed in the LCD, you'll do this
1. If day/date are displayed:
Turn clockwise to advance through the settings (year, month, date, language, day of week). Turn counter-clockwise to change the display.
2. If alarm is displayed:
Turn clockwise to advance through the settings (hour, minute, on/off)). Turn counter-clockwise to change the display.
3. If time is displayed:
Turn clockwise to advance through the settings (hour, minute, AM/PM). Turn counter-clockwise to change the display.