To make a laptop wireless, a signal is necessary, either available at a home network or any public Wi-Fi location, and a wireless card or built-in wireless connection is required for a laptop to pick up the signal.

How Do I Connect A Wireless Printer to a Wireless Laptop?

Printers that can be networked will come with either a wireless adapter or a network adapter. 

Since the question states wireless printer then let's assume that it has a wireless adapter. You can then plug it directly to a wireless router or you can use it in what is called ad-hoc mode.

If you choose to use ad-hoc mode then be aware that printing will monopolize your wireless adapter in your Laptop.

There are some good step-by-step instructions at wikiHow;   "How To Set Up a Wireless Printer Connection".