The Back and Forward can be configured to navigate the active text using several different methods. The buttons are located on the top toolbar in the BibleReader.
The center "•" button will open the verse history list, which stores your last ten locations in the BibleReader. The left "<" button will take you back through that list, and the ">" will move you forward through it, acting much like the backward/forward buttons in an internet browser. These buttons are only available in the Gaeta and Lugano desktop modes.