Jinke Hanlin eReader A6 User Manual page 22

Choose 'Delete record' from menu of recently read interface,
press arrow keys to move cursor and press enter key to
focus on the record item, or press number key to focus on
the record item directly. Then, choose 'Delete' from menu to
delete the record.
<2>Switching Bookshelf
Under the bookshelf interface, press the menu button to
display the popup menu, then choose 'SD card' or 'Device
memory' to switch.
Device memory
Menu + SD Card
Menu + Device
memory
SD card