Find "Email"
Press Applications.
Press Email.
Select default email account
Press the name of the active account at the top of the display.
Press and hold the required email account until a pop-up menu is displayed.
Press Account settings.
Press Default account to turn on the function.
When the box next to the menu item is ticked (V), the function is turned on.
Exit
Press the Home key to return to standby mode.