Since the last update to the Evo a couple of weeks ago, the method for changing the HTTP proxy settings is similar to the initial instructions but a little different.  You still need your MSL etc etc..but in the new Advanced menu settings you have to first go to RTSP/HTTP settings, then they are now called HTTP proxy IP and HTTP proxy port, and they are reversed in order from the screen shot.  Change them both and you should be all set.