In order to delete your account follow these steps:
1) Go to the main Menu of the app (by clicking 3 lines icon in the bottom left on iPhone, or on the top left on Android)
2) Click on "Support"
3) Click "Delete Account"
4) Make sure to choose a deletion reason and click "DELETE ACCOUNT"
5) Log in to the email you've signed in with and confirm the deletion of your account (you should receive the delete account confirmation email in about half an hour or less).
If you haven't received it to your main inbox, please make sure to check your "spam" or "junk" inbox, as it may have gone there.
6) After you've done all of the steps above your account is deleted.