Firstly, you have to reach the Roku channel store. In there, you have to type the name of the channel as DC Universe and then wait for the results. Choose DC Universe from the result and then check for the channel information. And then, you have to select the Add channel option. After the downloading process, access the app to get the activation code. Now, visit dcuniverse.com/activate to key in the activation code. Check the code twice and then click the Submit button. This will start the activation process, and now you can stream all your favorite content on your TV screen.