Hi,
for meeting the requirement you must be resident in Denmark at a minimum the day before your start your education.
This means that you must be in/live in Denmark no later than the day before starting education.
The best for you would be to have a public registered address in Denmark. But it is also possible to prove in other ways that you were actually living in Denmark the day before beginning education - for instance a landlord's statement that you have rented a property from a given date may be sufficient proof of a place of residence.
What matters is that you physically live in Denmark. Your danish address must be considered to be your actual residence. The address must also be considered as your current and usual place of residence.
Hope it helps..
Best regards,
www.a-kasser.dk