In this video from benjamoon we learn how to secure a linksys wifi network from a Mac. First type in your IP address in your browser bar which is 192.168.1.1 then press enter. If it asks for a password it is admin. Click on Wireless and here you can edit your name and who can access your wifi network. Under wireless security, go to WPA personal from the drop down menu. When you make your password, make it very challenging. He recommends just banging your hand against the keyboard, as long as you can write it down and remember it later. If it says Safari can't open the page, keep trying and it will work.