Try to follow the steps again and tell me which step you don't understand. (Also more details such as you're trying to play it with your PSP or a PSP emulator helps, too.)
https://sites.google.com/site/otomeundercover/patching-instructions#TOC-XdeltaUI
(The images in the instructions are for a different game but you just have to follow the same steps for Storm Lover Kai.)
If you're the same person who asked me on YouTube, then for the hash code, you don't need to input it in xdelta program. Just follow the steps shown above.
Please note that you need the game's ISO file in order to apply the patch. (You can buy the game and rip the ISO yourself or you can find it on the Internet but the latter case is not quite legal. Anyway, I can't provide you the ISO file and you can't ask for it on this forum either.)