You need to override method fo admin and you can change title according to requirement on add/change page of django admin response.context_data['title']
from .models import MFM
class MFMAdmin(admin.ModelAdmin):
def render_change_form(self, request, context, add=False, change=False, form_url='', obj=None):
response = super(MFMAdmin, self).render_change_form(request, context, add, change, form_url, obj)
response.context_data['title'] = "Settings on my fancy Models" if response.context_data['object_id'] else "Add my fancy Models"
return response
admin.site.register(MFM, MFMAdmin)