Follow these instructions to configure the Safari browser to use a Proxy Server:
Click on the "Safari" menu at the top of the screen.
Click on the "Preferences..." menu item.
Click on the "Advanced" tab of the menu bar.
Under "Proxies:", click on the "Change Settings..." button.
Place a check in the "Web Proxy (HTTP)" checkbox.
In the Address field, enter the IP Address of your Proxy Server, and the Proxy Server Port Number in the Port field. You will receive the IP Address and Port Number of your Proxy Server(s) in a separate email.
Click the "Apply Now" button.
Now when you surf the web, you will be surfing by using the Proxy Server. The first time you surf, depending on your account's authentication settings, you may be asked to enter your credentials, which were supplied in your Welcome Email.
To stop using the Proxy Server, repeat the above steps, but uncheck the box that says "Web Proxy (HTTP)" in the "Change Settings..." section.