To cancel your subscription you must cancel from the platform that you purchased on.
The below video is showing how to cancel a subscription purchased via Play Store:
If you have purchased your subscription via Play Store or Smule.com - please check the respective article and video for it.
*Please be advised that subscriptions purchased via iTunes/Google play will not be displayed in your Smule profile, they can be managed only via the respective iTunes/Google play account.
To cancel subscription via Google play:
Open the Google Play Store app
Sign into the correct Google Account
Tap the Menu button (three horizontal lines)
Then select Smule
Tap Cancel Subscription
Follow the onscreen instructions
In case you have any questions, you can always contact the support by clicking on "Submit request"