To give superuser permission to the existing user:
1. Go to ```/opt/openwisp```
2. Find `manage.py` file.
3. Find python environment. (I think it must be called `venv` or `env`)
4. Run `source venv/bin/activate`
5. Run `python manage.py shell`
6. Run ```
from django.contrib.auth.models import User
user = User.objects.get(username="myname")
user.is_staff = True
user.is_superuser = True
user.is_admin = True
user.save()
```
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2. Find `manage.py` file.
3. Find python environment. (I think it must be called `venv` or `env`)
4. Run `source venv/bin/activate`
5. Run `python manage.py createsuperuser`