In order to delete your account you will need to log in the app, there you can choose the 'delete my account' option located in the menu in the right. After you choose the 'yes' option to delete the account an email with the account delete link will come to your email. After opening that link your account will be deleted.
Alternatively you can delete your account by following this
link where you can enter your email address in order to receive the deletion link.