Tap the "App Store" button. It should open up the top menu (if you haven't updated or searched the store itself yet.)
- Wait a moment for the App Store to open. It will find any available updates, and if a Presence App update is found, it will be shown to you as a red circle with your others in the "Updates" on the lower right.
- Tap "Updates."
- Find Presence App and tap the button "Update."