How do I connect the M720 mouse using Unifying software?

To connect with Unifying software, first download it from http://support.logitech.com/software/unifying. Ensure M720 is on and a Unifying receiver is plugged in. Press and hold one of the toggle buttons under the display for 3 seconds (LED for selected channel starts blinking fast). Open Unifying software and follow on-screen instructions. Note: Unifying software is required to pair mouse with another receiver or an additional channel on existing receivers. All three Easy-Switch channels can be paired via Bluetooth Smart or Unifying, and a Unifying receiver is included in the package.