How to manually update apps on your iPad:
Open the App Store
Enter 'e-Reception Book - Visitor Management' into the search bar
Click on the logo
Please note 'Update' will not show if you don't click into the App. Update can also not show if you are already on the latest version.
To turn on or turn off automatic updates:
On your iPad, go to Settings > [your name] > iTunes & App Store. Then turn on or turn off App Updates.