You can do this by logging into the web portal or through the Epassikortet app.
In the web portal:
Go to "My card" and select "Order card", choose a reason and a new card will be ordered and sent to you.
In the mobile app:
Go to "Settings" and select "Order replacement card".
This will block your existing card while a new card is ordered.
Any replacement card fee may be deducted directly from your balance.