Manually loading a PS3 save data?

OK. so first i asked a question about a save data with Sonic Unleashed. Someone answered try manually loading it. So then i asked a question about how do you manually load it. Someone answered ive never heard of manually loading it unless its on a USB >_> so here i am asking HOW TO MANUALLY LOAD IT WHEN ITS ON A USB! btw ive put my data onto a USB ^_^ Please help me :(