You can use Logitech Unifying software to connect your keyboard or mouse to your computer. 
NOTE: If you don't already have it installed, you can download Unifying software from the Software Downloads page.

1. Launch the Logitech Unifying software.
   • Windows: Start > Programs > Logitech > Unifying > Logitech Unifying Software
   • Macintosh: Application / Utilities / Logitech Unifying Software
2. At the bottom of the Welcome screen, click Next.
   NOTE: These instructions use Windows screenshots for a keyboard. Macintosh will look slightly different, but the instructions are the same for keyboard or mouse.

   

3. When you see the "Restart the device…" window, follow the on-screen instructions to turn your device off and then back on.

   

4. When your device is detected, you'll see a "We have detected your…" confirmation screen. Type a test message in the field provided to make sure it works.
5. If your device connected successfully, click Yes and then Next.

   

6. If your device doesn't work right away, wait a minute to see if it connects. If it doesn't, select No and then click Next to restart the pairing process from Step 1 above.
7. Click Finish to exit the Logitech Unifying Software (or Pair Another Device to pair additional devices). Your device should now be connected.