Computer now connected to router by Ethernet but need to go wi-fi

[#1]

I know I will sound dumb, but I am not sure even from http://www.plus.net/support/broadband/wireless_broadband/wireless_connect_win7.shtml how to change the connection type from Ethernet to wi-fi. I do have apparatus on the other side of the computer that is connected wirelessly, but somehow the set up on the Internet side is confusing me. Hopefully you'll be able to helpme. Please!

[#2]

If the unit has a wifi connection then just remove the network cable, and then check to see if it still has an internet connection.
From the link you are using W7, cant help there, but usually you need to enable the wifi, some laptops have a switch to turn it on/off. If it is enabled then it should connect after you put the password in the security box.

[#3]

Thank you! The hardest part was getting the cables out, they having been in so long!