You can update your apps through the “App Store” and the “Play Store”. Here’s a simple procedure you can follow.
For iPhone, iPad, iPod touch Users
1) Open the “App Store”.
2) Tap on “Updates” in the menu.
3) Tap on app you want to update and tap on the “Update” button.
For Android Users
1) Open the “Play Store”.
2) Tap on “My apps” in the menu.
3) Tap on app you want to update and tap on the “Update” button.