1. Tap to shoot, hold to record video. Once you’re on Snapchat’s main screen, taking a picture is pretty easy for those who have ever used their phones’ cameras before. If not, here’s a quick guide: Tap an area of the picture you want your phone to focus on. Tap the big round circle to take a picture. Hold the big round circle to take a video. 2. Save your own shots. The icon to the right of the timer, a downward-facing arrow, allows you to dump the shot you just took into your phone’s traditional gallery. It’s useful if you want to save your shot for future purposes, as there’s no other way to do so once you’ve sent the picture out. 3. Set picture time limit. Tap on the stopwatchlike icon in the lower left and you can set the specific time that you want your picture to be available for a friend to view. You can go all the way from a blink-and-you’ll-miss-it 1 second to a maximum duration of 10 seconds. 4. Add a caption. Tap in the middle of the p...