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Email privacy@nerish.app with a short description of the problem, which device you're on (iPhone or Android), and how you sign in.
Apple, Google, and email sign-in each create a separate Nerish account. Sign out from Settings and sign back in with the method you used before. If you used Apple's "Hide My Email", your account email is the relay address shown in Settings.
Make sure notifications are allowed for Nerish in your device settings, then check your reminder time in Settings. Reminders arrive at the time you choose when someone is due for a follow-up within the next week or an important date is coming up.
Subscriptions are managed by Apple or Google: on iPhone, open Settings → your name → Subscriptions; on Android, open Google Play → Profile → Payments & subscriptions. Deleting Nerish doesn't cancel a subscription.
In the app: Settings → Delete account. If you can't get into the app, see how to request deletion by email.