Renewal settings and subscription details are not managed in the app - you must got to the app store you used for the original purchase.
If you purchased The Dyrt PRO through the website, you can turn off auto renew from your profile page. If you purchased The Dyrt PRO through the app, please go to the "Profile" tab in user settings which will link you to the correct app store to update your settings.
If you used Apple to purchase PRO, then you need to log into the Apple App store to manage the subscription.
If you used Google to purchase PRO, then you need to log into the Google Play Store to manage the subscription.