Configure a proxy server

How do I know if I need to do this?

1  Get server address and port information from your Internet Service Provider (ISP) or network administrator.
2  On the Tools menu, click Connection Settings.

This opens the Internet Explorer Internet Properties dialog box.

3  Click the Connection tab.
4  In the Connection part of the dialog box, make sure you select the correct connection method.

How do I know which one to select?