If you have an AR LaunchPad LEARN account, your dashboard will have a code up towards the top right. This code is what you and other people will enter into the LEARN side of the free Experience Viewer app to interact with your content.
Using The Code In App
To use your LEARN code in the AR LaunchPad app:
Open the app
Open Menu and tap Switch Modes
Tap Learn Codes button
Type your code into the text box
Press the plus button when it changes to darker red.
If the code is valid, it will add the code to the list.