Problem with ForeignKey

[kmvit]

Hello!

How can I connect this model to my model. My model

class Order(models.Model):
title = models.CharField(max_length=200)
born = models.DateTimeField(default=timezone.now)
user = models.ForeignKey(User)
email = models.EmailField()
files = models.ForeignKey(Picture)

I have a form of adding order:
class AddOrderForm(forms.ModelForm):
class Meta:
model = Order
fields = 'all'
widgets = {
'body': TinyMCE(attrs={'cols': 80, 'rows': 20}),
}

How to realize adding files to the order add page ?