Omg, i can't beleive i have to even post this, it is sooo easy -.-
Step 1. Download a Gamesave, it should either be in a .zip file or a .rar file.
Step 2. Unrar it or un archive the .zip or .rar file.
Step 3. Plug in your PSP to your computer with a USB plug.
Step 4. Put the UCUS98716 folder in your PSP/SAVEDATA folder.
Step 5. Replace all, if it asks.
Step 6. Now go online and enjoy your G-save.
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You don't need to activate it or anything just play the game, and DO not go to charactor customization otherwise your psp will freeze. And do not change your load-out. Unless u do not like the weapon it has saved on it.