Help using this site....

Im new here. I need help dowloading a PSX game and put it in my PSP. I want to download Digimon World 3. Once I save the file it goes to WinRar. What do I do after it?

https://www.romulation.org/forum/index.php?topic=3880.0And do a search for "eboot", that should hopefully give a guide on how to convert, otherwise check the tutorial section.