To manage your subscription you will need to visit https://www.actionnetwork.com/login using a desktop or mobile web browser—not available on the app, only desktop or mobile browser.
Once you're logged in, hover and click on your avatar at the top right of the homepage. On the drop-down menu, select Settings and then toggle into the Manage Subscription section.
From here, you will be able to update your billing details, manage the subscription type (annual to monthly or vice versa), cancel an active subscription, and/or contact support.