i dont know how to set up proxy ?

some time i can not open some link in my computer that time i hve to change proxy but i dont know how to change

 please

if you have any idea please help me

Change Your Proxy Settings on Internet Explorer



1. 
   
   Step 1
   
   

   Power up your computer and open Internet Explorer. If it isn't already installed, visit the Microsoft Web site to download the latest version

   
   
2. 
   

   Step 2

   
   
3. 
   

   Go to the 'Tools' tab.

   
   
4. 
   
   Step 3
   
   

   Select 'Internet Options.'

   
   
5. 
   
   Step 4
   
   

   Click on the 'Connections' tab.

   
   
6. 
   
   Step 5
   
   

   Hit the 'Settings' button.

   
   
7. 
   
   Step 6
   
   

   Look over the list of settings options, then click on the circle beside the one that you want.

   
   
8. 
   
   Step 7
   
   

   Click 'OK.' Your proxy settings have now been changed. If you want to change them again, simply follow these steps, but make a different selection from the settings options list before clicking 'OK.'