Just to be safe, we recommend saving a backup of your page sets and books to iCloud first. You can find step-by-step instructions in the Protect, Recover, and Share Page Sets support section.
Once you have saved a backup, make sure your device’s iOS is fully updated. For instructions, see http://support.apple.com/en-us...
Then, open the App Store app. Go to the Updates section. Scroll down to find simPODD in the list and tap Update next to it.
