To upgrade your current subscription to an annual subscription, follow these steps:
How-to for iOS:
Tap into your Monthbook or Monthly Mini subscription
Tap the Settings (gear icon), found in the upper right corner
Tap "Manage subscription"
Under the "Billing Cadence" section, tap "Billing Frequency"
Tap the "Pay Annually" option
Be sure to tap "Save" and then "Done"
How-to for Android:
Tap into your Monthbook or Monthly Mini subscription
Tap the Settings (gear icon), found in the upper right corner
Tap "Manage subscription"
Under the "Billing Cadence" section, tap "Billing Frequency"
Tap the "Pay Annually" option
Tap "Save" and then tap "Done"
Additionally, the videos below will walk you through the step-by-step process of upgrading to an annual subscription on both iOS and Android devices:
For iOS: How to Upgrade to an Annual Subscription
Android
Learn how to upgrade to an annual subscription from Chatbooks.com here.