Step 1: Add as many journals as you would like to your bookshelf. For help on how to do this see the tab: Adding a journal to your bookshelf.
Step 2: After you have added the titles you want you can edit the names of both your bookcases and your shelves.
Step 3: To edit the names of your bookcases and shelves, simply press 'Edit', located in the upper right-hand corner of the screen. This will open up a view that allows you to click directly into the labels for both the bookcase and the bookshelves to change the names. After you are finished click 'Done', located in the upper right-hand corner of the screen.