The AnkiDroid Flashcards Android application, developed by the AnkiDroid Open Source Team, has features that let you keep your AnkiDroid flashcard collection in sync with the AnkiWeb online service.
If you have created an account with AnkiWeb to use these features, either from within AnkiDroid or directly on AnkiWeb, you may request deletion of that account at any time, in accordance with AnkiWeb’s data handling policies.
If you no longer have AnkiDroid installed, or you would like to delete the account directly now on the web:
Follow the process on AnkiWeb’s account removal page.