setting up comp to an existing wireless network?

[P Kennedy]

I had to reformat my computer, I already have a wireless connection. I went into my network connections and it is empty. I dont think i go to create a new connection?Since It already exists. I wento the wireless network setup wizard it says print off your settnigs and enter them into each device in the following order;wireless access point, each additional computer you may want to add, and each wireless device you want to set up. What do they mean enter it into each device?Does that mean I have to enter it into the other 2 computers in the house? =/ Why is my network connection box empty