power on holding the vol. down button with the power button. It will load a white screen with the android logo skateboarding or something. There it will say your hBoot and if you have S-On or S-off.
It will start to try to load a file PC136.zip (or something I forget the exact title), this is fine, it will say the file is not found (unless you have it installed on the root of the SD card). Then just reboot your phone from this menu after writing down your info.