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Open Terminal(Ctrl+Alt+T).
Browse to your project source directory(where 'manage.py' exists):
_$ cd <del>project</del>_
Note: Replace 'project' with your directory name.
Now execute these commands:
$ _python manage.py shell_
Then the interactive python shell with django powers will appear. Then type in:
$ _from django.contrib.auth.models import User_
$ _User.objects.get(username="<del>NameHere</del>", is_superuser=True).delete__()_
You should replace the name of the superuser you created with NameHere in the last command.