Because the XP-420B lacks an LCD screen, you must use a software tool called (or similar utility). Here is the exact process.

Some newer XP-420B models accept Bluetooth dongles. Bluetooth is easier to pair than WiFi for mobile users, but range is limited to 30 feet.

The XPrinter XP-420B is a 4x6 thermal label printer that supports USB and Wi-Fi connections. Setting it up over Wi-Fi allows multiple computers or devices on the same network to print without a direct USB cable.

Keep a $50 Raspberry Pi or old laptop connected via USB to the printer. Share the printer via Windows Network Sharing. Connect your main laptop wirelessly to the shared printer. This bypasses the XP-420B’s poor WiFi entirely.