Add Custom HTML to Django Admin Form Templates

1. Define change_form_template in the admin.py module

Specify the location of the custom template

admin.py

class BookmarkletAdmin(admin.ModelAdmin):
    change_form_template = 'bookmarklet/admin/change_form.html'

2. Write the template

It's easier to write by inheriting admin/change_form.html.

{% extends 'admin/change_form.html' %}
{% block field_sets %}
{% for fieldset in adminform %}
{% include "admin/includes/fieldset.html" %}
{% endfor %}
Write something you like here
{% endblock %}