After you sign up for a 10-day free trial of Biblingo, you should receive an email from support@biblingo.org to create a password. Once you've created a password, you can log into the mobile app on your mobile device, or the web app at app.biblingo.org.
The mobile app is available to download for free in both the Apple App Store (for iOS) and Google Play Store (for Android).
If you don't see the email after a few minutes, please check your Spam folder just in case. If the link expires before you have a chance to use it, you can go to app.biblingo.org and click 'Forgot Password' to get a new link.