For Android users:
▪ Open the Google Play app;
▪ Tap the profile icon in the top right corner of the screen;
▪ Select "Manage apps & device";
▪ Under "Updates available", tap "See details";
▪ Next to the desired app, tap "Update" (to update all apps at once, tap "Update all").

You can also follow the instructions at the following link.

  For iOS users:
▪ Open the App Store;
▪ Tap your account button or profile picture at the top of the screen;
▪ Scroll down to view pending updates and release notes;
▪ Tap "Update" next to the app to update it individually, or tap "Update All".

You can also follow more detailed instructions at the following link.