To access the new version of the Moonpig IE App, you will need to download it from either the App Store or Google Play Store.
If you already have the Moonpig App installed, its likely you will need to update. The IE region is available on version v7.181.0 or above. Visit the App Store directly to check for an update.
You can then 'Change Region' from the 'Account' tab within the App.