Hi
@Musawvir,
thank you for addressing this question. As @Nelly rightly gave you the contacts for postal and personal application is one of ways. Just one more addition, there seems to be the option to do it online(since 1.08.2018) as well:
****://um.dk/en/travel-and-residence/legalisation/
You have to use the webshop of the ministry:
****://um.dk/en/travel-and-residence/legalisation/
Sadly i couldnt find out how much it might cost.
Wish you good luck and if there any other question we are happy to assist you with them.
Best regards,
Nilab