How can I change my profile picture?

On mobile devices:

In the conversation list:

1. Tap your Profile in the upper left corner.
2. Tap Settings  .
3. Tap Account.
4. Tap Picture.
5. Tap Camera  and then Shutter  take a new picture.
6. Alternatively, tap the camera roll or Picture  (on Android) in the lower left corner to choose a picture from your device.
7. Tap OK to confirm your new profile picture.