Change Proxy Sever Setting-Internet explorer, Google Chrome, Mozilla Firefox

Change proxy server settings in Internet Explorer
Proxy settings are used to tell Internet Explorer the network address of an intermediary server (known as a proxy server) that is used between the browser and the Internet on some networks. Changing proxy settings is something you usually only have to do if you are connecting to the Internet through a corporate network. By default, Internet Explorer automatically detects proxy settings. However, you might need to manually set a proxy with information supplied by your network administrator. Here's how:

To change proxy server settings

1. Open Internet Explorer by clicking the Start button Picture of the Start button. In the search box, type Internet Explorer, and then, in the list of results, click Internet Explorer. 
2. Click the Tools button, and then click Internet Options.
3. Click the Connections tab, and then click LAN settings.
4. Select the Use a proxy server for your LAN check box.
5. In the Address box, type the address of the proxy server.
6. In the Port box, type the port number.
7. If your network requires separate proxy addresses for different services, such as HTTP, HTTPS, or FTP, click the Advanced button, and then type the individual proxy server addresses to use.
8. When you are finished making changes, click OK until you return to Internet Explorer.

 Change proxy server settings in Google Chrome

Follow these steps to change your proxy setting (for Windows)

1. Click the Chrome menu on the browser toolbar.
2. Select Settings.
3. Click Show advanced settings.
4. In the "Network" section, click Change proxy settings. ...
5. Click LAN settings .
6. Deselect the "Automatically detect settings" checkbox.

 Change proxy server settings in Mozilla Firefox

Follow these steps to change your proxy setting

1. Launch Mozilla Firefox. 
2. Click the orange "Firefox" menu at the top of the window, hover over "Options" and select "Options" from the menu that slides out.
3. Click the "Advanced" tab at the top of the Options window.
4. Click the "Network" tab and select the "Settings" button in the Connection section. The Connection Settings window pops up.
5. Click the "Manual proxy configuration" radio button.
6. Type the IP address of your proxy in the appropriate field. For example, if you use a HTTP proxy, type the IP address in the HTTP Proxy field.
7. Type the proxy port number in the appropriate Port field, next to the proxy IP address field. 
8. Click "OK" two times to apply and save the new proxy settings.