need wireless network help

Hooked up to my G3 clamshell is a D-Link USB wireless network adapter. With my PC i just go to establish a wireless network connection and setup to automatically connect to my network connection. I am really horrid with networking, so I didn't encrypt the connection or password protect it because well, I don't know how... But I have had to type in my connection name for it to appear otherwise my PC can't find it. So, how can I do this with my Mac?? Is there some kind of wireless network wizard I can use and just type in my network name to get automatically connected or is it al lot more complicated?

Bryan