I want to create django popup form in my project

Why not use bootstrap modals instead?

For example https://pypi.org/project/django-bootstrap-modal-forms/

Examples
To see django-bootstrap-modal-forms in action clone the repository and run the examples locally:

$ git clone https://github.com/trco/django-bootstrap-modal-forms.git
$ cd django-bootstrap-modal-forms
$ python -m pip install -r requirements.txt
$ python manage.py migrate
$ python manage.py runserver

Signup form in Bootstrap modal
For explanation how all the parts of the code work together see paragraph Usage. To test the working solution presented here clone and run Examples.
forms.py

from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth.models import User
from bootstrap_modal_forms.mixins import PopRequestMixin, CreateUpdateAjaxMixin


class CustomUserCreationForm(PopRequestMixin, CreateUpdateAjaxMixin,
                             UserCreationForm):
    class Meta:
        model = User
        fields = ['username', 'password1', 'password2']

signup.html

{% load widget_tweaks %}

<form method="post" action="">
  {% csrf_token %}

  <div class="modal-header">
    <h3 class="modal-title">Sign up</h3>
    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
      <span aria-hidden="true">&times;</span>
    </button>
  </div>

  <div class="modal-body">

    <div class="{% if form.non_field_errors %}invalid{% endif %} mb-2">
      {% for error in form.non_field_errors %}
        {{ error }}
      {% endfor %}
    </div>

    {% for field in form %}
      <div class="form-group">
        <label for="{{ field.id_for_label }}">{{ field.label }}</label>
        {% render_field field class="form-control" placeholder=field.label %}
        <div class="{% if field.errors %} invalid{% endif %}">
          {% for error in field.errors %}
            <p class="help-block">{{ error }}</p>
          {% endfor %}
        </div>
      </div>
    {% endfor %}
  </div>

  <div class="modal-footer">
    <button type="button" class="submit-btn btn btn-primary">Sign up</button>
  </div>

</form>

views.py

from django.contrib.messages.views import SuccessMessageMixin
from django.urls import reverse_lazy
from django.views import generic
from bootstrap_modal_forms.mixins import PassRequestMixin
from .forms import CustomUserCreationForm

class SignUpView(PassRequestMixin, SuccessMessageMixin, generic.CreateView):
    form_class = CustomUserCreationForm
    template_name = 'accounts/signup.html'
    success_message = 'Success: Sign up succeeded. You can now Log in.'
    success_url = reverse_lazy('index')

urls.py

from django.urls import path
from . import views

app_name = 'accounts'
urlpatterns = [
    path('signup/', views.SignUpView.as_view(), name='signup')
]

.html file containing modal, trigger element and script instantiating modalForm

<div class="modal fade" tabindex="-1" role="dialog" id="modal">
  <div class="modal-dialog" role="document">
    <div class="modal-content"></div>
  </div>
</div>

<button class="signup-btn btn btn-primary" type="button" name="button">Sign up</button>

<script type="text/javascript">
  $(function () {
    // Sign up button
    $(".signup-btn").modalForm({formURL: "{% url 'accounts:signup' %}"});

  });
</script>