no one says that a proxy can change your ip address
your programm cannot change it either...
i just told stated that it does not change your ip.
heres the description:
The UltraSurf is a proxy server that beats the rest of the proxy servers on the net by offering features that others do not including login, flash files, java script, orkut, youtube, and file downloads, file uploads. Along with this you will not have any annoying ads or annoying pop ups and you will travel at faster speeds than you can imagine.
if websites see me with a different ip, i would consider this a different ip. you cannot change your actual ip, but you can make others see you as a completely different one.