FREE TRIAL PROBLEM SOLVED
since this app offers you a free 7 day trial but does not offer you an in app way to cancel your subscription (which is probably a mischievous way to make money) heres how to unsubscribe:
Go to Settings > [your name] > iTunes & App Store.
Tap your Apple ID at the top of the screen.
Tap View Apple ID. You might need to sign in or use Touch ID.
Tap Subscriptions.
Tap the subscription that you want to manage. ...
Use the options to manage your subscription.
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Yarn - Chat & Text Stories, v1.6.0