I'm sorry about the issue. What is the brand/model of your Internet modem/router device?
Can you click on the Apple logo / menu, then click on About this Mac, then let me know your Mac OS X version, such as 10.6, 10.7, 10.8, 10.9, 10.10, etc.?
When you go to the Wi-Fi Setup -> Wi-Fi Setup Wizard option on the printer's screen in order to connect to your wi-fi/wireless network name, what happens? Is there any error or message?
And when you install the printer's driver/software on the computer, what happens?
Please reply at the box below. Thank you.