To get a DSB orange ticket you must book and pay for the ticket online at DSB´s Online ticket shop, www.dsb.dk. Note the service is only in Danish.
You print the ticket yourself. A seat reservation is included in the price and will be stated on your ticket when you print it. When you book an Orange ticket you will be asked to state you email address. Your e-ticket and your order confirmation will be sent to this email address. You will also be asked to provide proof of ID when you present your ticket on the train. The ID you use can be your credit card (not necessarily the one you used to pay for the ticket), driving licence, passport, etc. When booking the ticket, you will be asked for the name of the person (your name) to whom the ID was issued , along some of the digits printed on the ID. The ID information you provide is called Print Selv-ID (Print it yourself-ID) and is requested to prevent tickets being copied.
Remember to have both your printed ticket and your Print Selv-ID with you when you travel because the conductor will ask for both.