Steps
Open Profile > Account > Subscription to check the Pro access linked to your account. Billing management concerns a purchase made through a store.
The red area shows where to tap in step 1. If Manage subscription is offered, tap it to open the relevant management page. You can also find Karro directly in subscriptions for the App Store or Google Play account that made the purchase.
In the store, open Karro and check the offer and displayed renewal date. Follow the store's controls to change or stop renewal.
Review the store's confirmation, then return to Karro and refresh access if needed. If no purchase appears, check the store account; some Pro access is not a subscription billed to your own account.