stupid me!!

I did something very stupid just now. I keep trying to online but the wireless connection can't find the server. Then I restart the wireless and broadband but I still can't find the server. I thought that maybe the server down so I just ignore it. I wonder how come my sister can online but I totally can't connect. Keep on blaming the connection. Then, only I know that I didn't on the wireless of my laptop! Damn!! How can I be so stupid? Luckily at the last I found out that!