Log in to Justuno and click "Promotions" and then select "Edit Integrations" next to the desired Promotion.
On the "App Integration" tab, locate and click on the ExactTarget "Connect" button to launch the configuration options. a. Enter your Username and Password b. Select a ExactTarget list and click "Save.
Your Justuno will now sync new signups to your selected ExactTarget list as they come in!