ok plug psp into usb port(make sure you format memory stick first). Then download something called kxploit. you can find this at
www.psp-hacks.com in the download section. Then download winace(if u dont already have it). Then download some homebrew games from
www.psp-hacks.com in the download section. Then once the file is downloaded, extract it using winace. Then, open up kxploit and follow the directions(i.e. take the eboot file you downloaded and use kxploit to convert the file into the v1.5 form. Two files should be remade in the "games" folder of the E:/ drive. Then put all the other files that came w/the download and put it into the first file(the file that has no % signs in the name). Then you should be able to run the homebrew.
Hope this helped,
mfaheypride