You need to have a Collection before that will darken. Push Menu/Create New Collection and then choose a name. You might want to do some reading on how to name your collections so they will alphabetize correctly.
Once you have a collection put a book into it. Move the cursor to the book and then click the controller to the right. Select Add to Collection and choose your collection.
After you have a Collection then it won't be greyed out on the top line of the Home Screen anymore.
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