Open Light Paint App and tap on "Timelapse" mode. The app will automatically prepare the camera with optimal settings for your scene.
Position your iPhone with a clear view of the scene you want to capture. Make sure your phone is stable and won't be disturbed.
Simply tap the record button and let Light Paint App do the work. You'll see a timer and frame counter so you know how your timelapse is progressing.
When you're satisfied with the length, tap stop. Light Paint App will automatically process your timelapse and save it to your camera roll.
Now that you can create timelapses, try the other simple modes in Light Paint App