On your listening screen, tap on the Voice icon and select Create your voice. Tap Continue to create your voice. View the Terms of Use and hit the "Tap to Sign" button
Tap the 'record voice' icon and start reading the text (if you haven't yet, please allow the App to access your device's microphone). After recording, tap the 'play' button to listen to your recording (you also have the option to redo the recording). Tap the 'next' arrow icon and the "Create voice" button to generate your voice. You can now personalize your listening experience by selecting your Custom Voice.
Note: Voice cloning is a feature available on the iOS, Android, and the Web app. You can use your cloned voice for your readings, but not download an MP3.