You can delete your account at any time from Settings, inside the app. Deletion takes effect immediately: you’ll be logged out, and from that moment your account is invisible to everyone else, the same as if you had blocked every other user.
If you can’t log in, you can still request deletion at seacoveapp.com/delete-account.
Deleting your account is not the same as blocking one person. It removes your ability to use Seacove entirely, and it cannot be undone by logging back in with the same details.