From the home screen, tap the Menu key.
Tap System settings.
Scroll to and tap Accounts & sync.
Tap the desired account.
Note: Tap the Accounts & sync slider to ON or OFF as desired. Turning Accounts & sync OFF will disable all account syncronization.
Tap to check or uncheck the DATA & SYNCRONIZATION items as desired.
Once finished, tap the Back key.
The account synchronization settings are now changed.