Mighty Nimble subscriptions are managed through the App Store — so the controls live in iOS Settings, not inside the app.
Open subscription management
Two ways:
In the app: Settings → tap your Plus card when subscribed
In iOS: Settings → [your Apple ID at the top] → Subscriptions → Mighty Nimble
Either lands you in Apple's subscription management screen.
What you can do there
See renewal date — when you'll next be billed
Switch plan — monthly ↔ annual (Apple handles proration)
Cancel subscription — stops future billing; you keep Plus until the period ends
Re-subscribe — if you previously canceled
Canceling
Canceling through Apple does not delete your account or your data. You just lose Plus features when the current period ends and drop back to Free tier limits. Your routines, folders, and workout history stay.
Switching between monthly and annual
Choose the other plan from Apple's subscription screen. Apple prorates automatically — you won't double-pay.
Re-subscribing
Open the Plus card in the app or use the App Store. If you've subscribed before, Apple may remember and let you resume quickly.
Gifting / family sharing
Mighty Nimble Plus is not currently set up for family sharing. Each user needs their own subscription.