(any site that offers Flash game is great it doesnt have to be miniclip) and download the zip of any game (Note: Games that use the Arrows are best on the psp")
Click on the zip file and extract the .Swf file to the desktop
Connect the usb and go in Root>Psp>Game(in the folder "Game" you create the folder called "Flash")
In Flash you put the .swf file and rename to anything you want
Go in the internet browser and type this "File:/psp/game/common/flash/gamename.swf"
The game will load and you ready to play Have fun