Follow these steps to add captions to your Monthbook- below is a video how-to as well:
Tap into your Monthbook Subscription.
Tap into the specific Monthbook you want to add captions to.
Tap into a photo you want to add a caption to.
Tap on "Caption."
Write and edit your caption.
Tap "Done" once your caption is added.
Set photo layout to "Border" or "Square" for your caption to show. Tap "Done." Your caption is now added!
To edit the caption, tap back into the photo with the caption, and click "Caption." Edit your caption and then tap "Done."
How to Add Captions to Your Monthbook - iOS
How to Add Captions to Your Monthbook - Android