[b]"Getting HTTP Error 407 - Proxy Authentication Required. How Do I Fix This?"[/b] or [b]"HTTP Error 407: Why Am

Lol, "robot yelling at you" is spot on.

For Firefox users:
Type *about:config* in the address bar, then search for "network.proxy".
You’ll need to set *network.proxy.username* and *network.proxy.password* (right-click to add new strings).

If that’s too technical, maybe try a portable browser like Portable Firefox with pre-set proxy settings.