This wikiHow teaches you how to find a list of all your app subscriptions in the iTunes Store and edit your membership information using an iPhone or iPad.
Steps

Step #1. Open the settings menu on your iPhone or iPad
Search for and tap it

icon on your home screen to open the Settings app.

Step #2. Tap on your name at the top
Your name and picture will appear at the top of your settings menu. Tapping it will open your Apple ID menu.

Step #3. Tap on iTunes & App Store
This option is next to the

icon in the Apple ID menu.

Step 4. Tap the email address associated with your Apple ID at the top
Your email address is in blue letters at the top of your screen. Tapping on it will open a new pop-up window.

Step 5. Tap on Show Apple ID from the pop-up menu
This will open your account settings on a new page.
You may be asked to confirm your account by entering your Apple ID password or Touch ID

Step 6. Scroll down and tap Subscriptions
This will open a list of all your current and expired iTunes subscriptions, including Apple Music and third-party apps.

Step 7. Tap on a subscription from the list
This will open your subscription details on a new page. Depending on the app, you may be able to change your membership plan, cancel your subscription, or resubscribe to an expired service.