Setting up your HP printer via 123hp.com/setup is a straightforward process. First, unbox your printer, plug it into a power source, and turn it on. Load paper into the tray and install the ink or toner cartridges. Next, visit 123hp.com/setup on your computer or mobile device and download the appropriate HP printer driver based on your model. Run the installer and follow the on-screen instructions to complete the driver installation. This ensures your printer is properly configured to communicate with your computer.