Share your printer over a home network using windows 7?

Okay so i just brought a new desktop windows 7....i previously had a XP and i connected all my laptops and desktops together on my rotator so everything will print wirelessly, but when i recived the new computer i do not know how to configure the new one in the rotator without messing up the infromation with the rest....please give me a step by step explanation in connecting the new computer (keep in mind this is windows 7 too)....im pretty sure i need to doing something with findout the IP number or Port name but please EXPLAIN thatnk you