If you are moving from one address in Denmark to another address in Denmark, you have to inform the authorities.
The online self-service is primarily in Danish (depending on which municipality you live in or are about to move to), but you can always get help to fill it in at the local Citizen Service centre. Remember to book an appointment. Or maybe you know a Danish speaking person, who can help you. You need MitID to be able to use to the self-service:
Remember to bring your MitID, if you need help with a self-service at the local Citizen Service centre.
You can at the earliest inform the authorities of your change of address 4 weeks before you move and it must be done no later than 5 days after you have moved to your new home.