1.)File can be downloaded here http://cwcheat.consoleworld.org/downloads.php
2.)Select a CW Cheat program that is compatible with your Custom Firmware version (CFW).
3.)After downloading, Extract it using WinRar and there will be 2 INSTALL folders ,one is INSTALL 3.90 and INSTALL.(mine is 3.90, this is only an example)
4.)If you're using 3.90,put the seplugins folder from INSTALL 3.90 in the root of your memory stick.if you are using a CFW other than 3.90,put the seplugins folder from INSTALL in the root of your memory stick.
5.)Turn off your PSP (not suspend)
6.)Press and hold the R button.(do not turn on your PSP yet!)
7.)Hit the power button.you may now release the R button.
8.)Instead of seeing the normal PSP Startup logo a different a prompting screen will appear.Select "Plugins"
9.)Enable cwcheat.prx [GAME] and cwcheatpops.prx [POPS] and exit recovery mode. (dont forget to save changes)
10.)To activate cheats, start a game normally.In game, press and hold select for about 3 seconds and the cheat menu will pop out.
The menu can be easily figured out... hope this helps guys! you can message me anytime for additional help.