To override the default Django Admin templates, you need to create a 'templates' directory within your app directory. Inside the 'templates' directory, create another directory named 'admin' and place your customized template files with the same names as the ones you want to override.
Example file structure:
myapp/
├── templates/
│ └── admin/
│ └── change_form.html
In the above example, 'change_form.html' is the customized template file that will override the default change form template used by Django Admin.