class CustomSignupForm(SignupForm):
    first_name = forms.CharField(max_length=30, label='First Name')
    last_name = forms.CharField(max_length=30, label='Last Name')
    phone_number = forms.CharField(required=True)
    address = forms.CharField(required=True)

    def signup(self, request, user):
        user.first_name = self.cleaned_data['first_name']
        user.last_name = self.cleaned_data['last_name']
        user.phone_number = self.cleaned_data['phone_number']
        user.address = self.cleaned_data['address']
        user.save()
        return user

    class Meta:
        models = User
        fields = ('email', 'username', 'first_name', 'last_name')