How do I set up HP wireless printer via 123.hp.com/setup?

I want to take the benefits of wireless printing technology for my official tasks. I have decided to use HP products, so I want to set up HP wireless printer with the aid of 123.hp.com/setup. I don’t have the solid and strong technical background to set up HP wireless printer. I am using 123.hp.com/setup first time, so I can experience problems. By opening this link, I have completed the downloading process of the software. I am doing all the right things to complete the process. After the downloading process, I am facing problems. So anyone can help me to setup HP wireless printer with the assistance of 123.hp.com/setup.