Here is a user guide on how to delete an account and its data from the app:

1. Open the app and navigate to the "Account" tab.
2. Click on the blue arrow located at the far right of your profile picture to access the "Detail Info" page.
3. Scroll down to the bottom of the "Detail Info" page to find the "Delete Account" button, which is highlighted in red.
4. Click on the "Delete Account" button to initiate the account deletion process.

Please note that once you confirm the deletion process, your account and all associated data will be permanently removed from the app and cannot be recovered.