#models.py
from django.conf import settings
class UserProfile(models.Model):
    user = models.OneToOneField(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    image = models.ImageField(default='users/default.png', upload_to='users')
    fields = models.ForeignKey('Field' ,null=True ,on_delete=models.SET_NULL)
    category = models.ForeignKey('Category' ,null=True ,on_delete=models.SET_NULL)
    description = models.TextField()
    interests = models.ManyToManyField('Interests')
    ...
   def save(self, *args, **kwargs):
       super().save(*args, **kwargs)
...
def userprofile_receiver(sender, instance, created, *args, **kwargs):
    if created:
        userprofile = UserProfile.objects.create(user=instance)
    else:
        instance.userprofile.save()
post_save.connect(userprofile_receiver, sender=settings.AUTH_USER_MODEL)
 #forms.py
 class SignupForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(SignupForm, self).__init__(*args, **kwargs)
        self.fields['first_name'].widget = forms.TextInput(attrs={'placeholder': 'Enter first name'})
        self.fields['last_name'].widget = forms.TextInput(attrs={'placeholder': 'Enter last name'})
    first_name = forms.CharField(max_length=100)
    last_name = forms.CharField(max_length=100)
    interests  = forms.ModelMultipleChoiceField(widget=forms.CheckboxSelectMultiple, help_text="Choose your interests", queryset=Interests.objects.all())
    image = forms.ImageField(help_text="Upload profile image ")
    fields = forms.ChoiceField(help_text="Choose your fields ")
    category = forms.ChoiceField(help_text="Choose your category")
    class Meta:
        model = UserProfile
        fields = ('first_name', 'last_name',  'name', 'image', 'fields', 'category', 'description', 'phone', 'facebook', 'twitter', 'skype', 'site', 'address', 'interests' ,'biography')
        widgets = {
             ...
            'description': forms.TextInput(attrs={'placeholder': 'Your description'}),
            'address': forms.TextInput(attrs={'placeholder': 'Enter address'}),
            'biography': forms.TextInput(attrs={'placeholder': 'Enter biography'}),
            ....
    }
    def signup(self, request, user):
        # Save your user
        user.first_name = self.cleaned_data['first_name']
        user.last_name = self.cleaned_data['last_name']
        user.save()
        user.userprofile.image = self.cleaned_data.get('image')
        user.userprofile.fields = self.cleaned_data['fields']
        user.userprofile.category = self.cleaned_data['category']
        user.userprofile.description = self.cleaned_data['description']
        interests = self.cleaned_data['interests']
        user.userprofile.interests.set(interests)
        user.userprofile.save()
# settings.py or base.py
ACCOUNT_SIGNUP_FORM_CLASS = 'nameApp.forms.SignupForm'
That is it. (: