How to Turn on Flash on Snapchat

Open the Snapchat app.

It's the white ghost icon on a yellow background. This takes you to the Snapchat camera screen.

Tap the lightning bolt icon.

It's in the top right corner of the camera page. Tapping this icon should remove the x below it, which activates your camera's flash. If there is no x below the lightning bolt icon, flash is already turned on.

Take a snap.

Tap the large circle at the bottom of the screen. Doing so will take a snap with flash enabled. There will be a short delay between tapping this button and the picture being taken due to the flash activating. Flash will work for both of your phone's camera directions. You can also hold this button to record a video with flash.