Mixin add field to fields in forms

Hello,

forms.py:

class Newsletterform(StandardMixin):

    class Meta:

        model = Newsletter

        fields = ['newslettername', 'from_link', 'to_list', 'email_subject', 'text_message', 'html_message' ]

Mixins.py:

class StandardMixin(forms.ModelForm):

    class Meta:

        abstract = True

    def __init__(self, *args, **kwargs):

        self.Meta.fields.append('owner')

        super(StandardMixin, self).__init__(*args, **kwargs)

i would append in Meta.Fields owner and after this super. But in Template this field are not shown. 

Why?

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