Action button on django model edit page

admin.py

class MyAdmin(admin.ModelAdmin):
    def response_change(self, request, obj):
        if "_activate_and_send_email" in request.POST:
            self.activate_account_and_send_email(request, (obj,))
            return HttpResponseRedirect(request.path)

        return super().response_change(request, obj)

submit_line.html

## In templates/admin/submit_line.html
...
    {% if opts.model_name == "myModel" %}<input type="submit" value="{% trans 'Activate and send email' %}" class="btn btn-warning" name="_activate_and_send_email" {{ onclick_attrib }}/>{%endif%}
...