how to override / bypass proxy servers (in simple language)?

When a network using proxy server to ban web sites (including Yahoo mail), how to override / bypass proxy servers (in language easy) to see these sites and access e-mail?.

Hey, let me tell you were frustrated with the proxy servers for years are not the answer. They do not, the information leak in the clear, unlock everything and are a pain. Get yourself a personal VPN and not look back. I did a couple of weeks ago and have had no problems since. It's worth the money at any time.

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