To use Bluetooth, change the channel on the bottom of the mouse, and click the connect button. Now, search for the mouse with a bluetooth manager of your choice and pair. In future it should connect as soon as you switch to that channel when your bluetooth is active. If you have problems with the mouse not showing when scanning, see Bluetooth LE device does not show up in scan
bluetooth]# hcitool lescan Invalid command in menu main: hcitool
Use "help" for a list of available commands in a menu. Use "menu <submenu>" if you want to enter any submenu. Use "back" if you want to return to menu main.