Edit Live Photos on iPod touch
In the Photos app 
, you can edit Live Photos, change the key photo, and add fun effects like Bounce and Loop.
Edit a Live Photo
In addition to using the photo editing tools (like adding filters or cropping a photo) you can also change the key photo, trim the length, or mute the sound in any Live Photos you take on iPad or iPhone.
Open the Live Photo and tap Edit.
Tap
, then do any of the following:Set a key photo: Move the white frame on the frame viewer, tap Make Key Photo, then tap Done.
Trim a Live Photo: Drag either end of the frame viewer to choose the frames the Live Photo plays.
Make a still photo: Tap the Live button at the top of the screen to turn off the Live feature. The Live Photo becomes a still of its key photo.
Mute a Live Photo: Tap
at the top of the screen. Tap again to unmute.