You can send a request to delete your Schibsted account on any site you have a Schibsted account with, or you can go to Schibsted account and choose the “Change profile” option on the Schibsted site. At the bottom of the page you will see the option “Delete my account”.
When you delete your Schibsted account, remember that all of your subscriptions and the ads that are connected to this account will also be deleted.