In the app, go to Settings → “Your data” and tap “Delete account”. Read what goes and what stays, tap “Delete my account” and confirm with “Delete”. The account is deleted straight away and can’t be recovered.
Your sign-in goes and your profile goes. The scores, fantasy lineups and ratings you entered stay, but without your name, and your roster card stays with the team. If you no longer have the app, you can request deletion with the form on panka.app.