In order to change the settings of your Schibsted account, including deleting the account, you must first accept the terms and conditions.
You can request the deletion of your Schibsted account from any of the sites on where you have accepted the terms and conditions. That site might ask you either for an ID or require that you answer a few questions to verify that you are the Schibsted account owner. Note that if you request account deletion on one site but use that same Schibsted account on another site, any subscription and/or ads associated with your account will also be deleted.
Remember to hide sensitive information, such as the CVV code on your payment card or your social security number, if you choose to verify yourself with an ID.