You have not set the bookmark for this edition on this device.
On screens less than 960px widescreens wider than 960px and using a clicking devicetouch screens wider than 960px:
- To set the bookmark to the current location, tap the grey bookmark icon (or ‘Set’)right-click the bookmark icontap the option Set/Reset bookmark.
- To return to the bookmark's location, even in a later session, tap the black bookmark icon (or ‘Go to’)left-click the bookmark icontap the option Go to bookmark.
Note: It is best to return to the bookmark in the same orientation (e.g. portrait) in which it was set.