如何在默认情况下选择Django ModelForm菜单项？

pip install django

python manage.py startapp app_name

from django.db import models

class Person(models.Model):
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30)

from django import forms
from .models import Person

class PersonForm(forms.ModelForm):
    class Meta:
        model = Person
        fields = ['first_name', 'last_name']

from django.shortcuts import render
from .forms import PersonForm

def add_person(request):
    if request.method == 'POST':
        form = PersonForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('success_page')
    else:
        form = PersonForm()
    return render(request, 'add_person.html', {'form': form})

<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
   <button type="submit">Submit</button>
</form>

from django.urls import path
from . import views

urlpatterns = [
    path('add_person/', views.add_person, name='add_person'),
]