You can redeem an audiobook credit in the following way:
1. From the 'For You' screen, tap on the Explore icon.
2. Tap on the search bar.
3. Select Audiobooks and type in the title, author, host or topic you would like to search for.
4. After selecting the title you would like, tap on 'Use 1 Audiobook Credit'.
5. Tap on 'Confirm'.