Plug your computers into the "B-Type" ports and your printer/device into the "A-Type" port.
If you lost the QR code and the USB drive, email the manufacturer. The generic support address associated with FJGEAR products is often found on Amazon seller pages. Look for your order history on Amazon or eBay and find the “Sell by” store name. Send them a message requesting the “USB sharing switch software for remote switching.” Include a photo of your device’s model number. fjgear usb 20 sharing switch driver download link
Here’s how it works: