Since you are trying to connect 3 laptops, the first one will have to be connected via the USB otherwise also known as the dongle, which will automatically connect through your USB port. The other two laptops has to be paired with the bluetooth. In order to use the bluetooth option, your laptops has to be bluetooth also. If your laptop has no bluetooth, you can buy a bluetooth USB adapter for them, which cost about $14 and up, depends where you get it from. Once you made your other laptops bluetooth, you just have to pair them with the mouse and keyboard. Hope this helps. For visual aid, I would do a search on YouTube on how to use a bluetooth receiver.