This should be done directly on the iOS or Android device.
How to turn on or turn off automatic updates on your iPhone, iPad, or iPod touch
Go to Settings.
Tap App Store.
Turn on or turn off App Updates.
For Android devices:
Open the Google Play Store. Tap the menu icon (☰) in the upper left corner.
Then select "Settings".
Under "General", find the item "Automatic app updates". Tap it to edit the update settings.
If you want to disable automatic updates altogether, select "Do not update apps automatically" now and tap "Done". The setting will be saved automatically. In the future, you will always have to update your apps manually.