To delete your PICS account:
This permanently deletes the account and its data on our servers.
Photos stay on the device only and are removed when you delete the app or delete the account in the app.
Deleting your account does not cancel your Apple subscription. To stop billing, cancel it in your iPhone's Settings under Apple ID, Subscriptions.
If you cannot access the app, email support@brightwaveapps.com for help deleting your account.