1. Swipe up from the bottom while in the app.
  2. Look for a circle containing a bell with a slash through it.
  3. If it is highlighted, tap it to turn mute off
    → if you do not see the bell icon, go to step 4.
  4. Flip the toggle switch on the side of the device above the volume keys.

Note: If your device is in a case, the switch may be hidden. Remove the device from the case to access the switch.