How can I delete/cancel my account?
just see on the top right corner of your screen you'll see the settings icon (like a wheel just next to the notification bell). There will be three options HELP,SETTINGS and LOGOUT. Choose settings and you'll see the four tabs click on account and scroll the page to the bottom you'll see your profiel picture if any below that will be a option 'Deactivate my account', click on that and your work is done. Maybe they'll ask the reason for leaving Duolingo but no problem. Hope it works ; )