Access the Music Studio.
Select the book that you would like to activate from the left hand menu.
You will then be asked to enter your Essential Elements Interactive Activation Code. Enter the code, then press the Submit button.
If you are having issues finding the Activation Code in your book, it can be found by clicking on the "Need Help?" link or by using the example below:
If you don't have an EEi Activation Code in your book, click the checkbox next to I use Essential Elements but my book doesn't have a code which will bring up the following dropdown for you to choose your book from:
After your new book has been activated, you can change between the books in the Music Studio and clicking on the Songlist tab on the left. From there, the different books will be listed in the dropdown menu at the top right of that page: