User Creation Form Django - add RecaptchaField

Question

I'm trying to add captcha field to Django UserCreationFrom and I can not solve it. I can not post everything what I tried because I'm trying modify this view about 2 hours. I have register form on my site made by Django UserCreationFrom - everything is ok but I decied to add Recaptcha. I have app name "accounts" and in this app I have view in which is this:

from django.contrib.auth.forms import UserCreationForm, get_user_model
from django.template.context_processors import request
from django.urls import reverse_lazy
from django.views import generic
from captcha.fields import ReCaptchaField
from captcha.widgets import ReCaptchaV2Checkbox

class SignUpForm(UserCreationForm):
    class Meta:
        model = get_user_model()
        fields = ('first_name', "last_name",
                  "username", "email", "password1", "password2")
    class Captcha(UserCreationForm):
        captcha = ReCaptchaField(widget=ReCaptchaV2Checkbox)


class SignUpView(generic.CreateView):
    form_class = SignUpForm
    success_url = reverse_lazy("login")
    template_name = 'accounts/signup.html'

Signup.html looks like this:

{% extends 'main.html' %}

{% block title %} Přihlášení {% endblock %}

{% block content %}

    <h2>Registrace</h2>
    <div class="box">
        <form method="post">
            {% csrf_token %}
            {{ form.as_p }}
            
            <button type="submit"> Registrovat </button>

        </form>

    </div>

{% endblock %}

I installed the django-recaptcha library - added it in settings. Also I have in settings my RECAPtCHA_PUBLIC and PRIVATE KEY and I'm registered in Google_recaptcha website.

My URLS looks like this:

from django.contrib import admin
from django.urls import path, include
import claim.views
import contact.views
from django.conf import settings
from django.conf.urls.static import static
from django.contrib.staticfiles.urls import staticfiles_urlpatterns

urlpatterns = [   
    # accounts
    path("accounts/", include("accounts.urls")),
    path("accounts/", include("django.contrib.auth.urls")),

As I said - the registration form works but no Captcha here:

But I cannot find how to modify UserCreationForm to add recaptcha. I found many ways how to add Captcha to your own form but no advice how to add in to UserCreaiton form. I also read this: Implement Django Simple Captcha with the existing django.contrib.auth.forms but it doesnt work for me.

I'm new to python, new to django and I'm creating my first full stack work.