Our most recent app version for iOS devices is 3.8.9 and your device must be running on iOS 8, 9 or 10.
**If you are running on an earlier iOS version, please make sure you are using app version 3.8.3.
You can always check which version you are running on by swiping the home screen of the app to the right, tapping on account and scrolling to the bottom to see the version.
If you do need to update, just go to your app store and search for Red Stamp, you'll be able to update there.
Thanks for using Red Stamp!