Welcome to Forum
There are lot of information and help here. There are lots of people who will help but your post does not give any information.
The link you have given does not seem to relate to you.
When you have wifi problems it is a good idea to read coffeetime
's list of details that will be needed to give you any help. You start off by posting a few of the first mentioned. http://www.pclinuxos.com/forum/index.php/topic,56672.0.html
If you are in doubt begin with:
Shortcut to see what may be working in your Networking
Root konsole do:
Find Network devices, here focus on wifi (but works for ethernet cards too). We need to know your Network card details.