I'm sorry about the issue. Is this a new computer or new printer, etc.?
What's the model of your internet modem / router device?
Can you please click on the apple logo / menu at the top, then click on About this Mac..., then tell me your OS X version, such as 10.6, 10.7, 10.8, 10.9, 10.10, 10.11, etc.?
Is there any error or message when setting up your printer?
Is there any error or message when installing the printer's software CD disk or download?
Please reply at the box below. Thank you,
Please type at the box below, then click on the Send button below to communicate with me, so I can help. Thank you,