admi.py

from django.contrib.auth.models import User
admin.site.unregister(User)
from app_name.models import User
admin.site.register(User)

extend_user_model.py

from django.db import models
from django.contrib.auth.models import AbstractUser

class User(AbstractUser):
    bio = models.TextField(max_length=500, blank=True)
    location = models.CharField(max_length=30, blank=True)
    birth_date = models.DateField(null=True, blank=True)

settings.py

AUTH_USER_MODEL = 'apps_name.models.User'