Form this you can choose the Book you wish to work with,
from the Books you have entered under Add New Entry
You can select the desired Book in 3 ways.
1. Type the name in the blue line, as you type the listing will sort alphabetically. Once your selection is at the top of the listing press the down arrow key, then press the right arrow key.
2. Press the down arrow key and move down the list until you reach the book you want to select then press the right arrow key.
3. Type the letters as in (1.above) when your name is the top name in the list press the Enter (or Return) key.