How to connect a wireless printer to an old gateway computer

[TR5]

My father gave us an old Gateway computer for the kids to use for homework. We have a Kodak ESP Office 2170 series wireless printer. How can we connect the 2, so they can print their homework out? I've downloaded the software but it won't detect or connect. Is the only way to use the printer , a USB cord?
Thank you in advance,
T.

 

[Emerald]

do you have a wireless router?

is the computer connected to the router?