If you are a Danish citizen and want the Danish Ministry of Foreign Affairs to be able to reach you if something happens on the trip, you can register on Danskerlisten. It takes a couple of minutes, and you do it yourself with MitID. The ministry's Rejseklar app gathers travel advice and registration in one place.
If you create an account with the same email, we gather the trip under “Trips” as soon as you have paid through the link. You do not need it, the request stands either way.