If you signed up for WITHU on your iPhone
Go to Settings > Apple ID, iCloud, iTunes & App Store > iTunes & App Store.
Tap your Apple ID at the top of the screen.
Tap View Apple ID. You might need to authenticate your Apple ID.
Tap Subscriptions > WITHU
Under Options, tap the subscription plan you want.
If you signed up for WITHU on your Android device
Open the Google Play Store.
Tap Menu > Subscriptions.
Tap WITHU > Cancel.
Return to the WITHU app and select your new subscription