Your menus will have options to be able to turn off the flash in certain modes.
The camera also has external buttons which will turn the flash on or off. Read your user manual.
The button which has the SET inside has four selectors. The right selector has a flash on/off button to turn the flash on or off. The flash usually will flash when set to flash all the time and not in AUTO mode. The AUTO mode may not allow you to turn off the flash. You probably have to choose another mode to allow the flash to be turned off.
If you do not have a user manual, here is a link to a free pdf download:
User manual Canon A400
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