Resigning save files is a relatively simple process.
Though sometimes it can be a pain, and you may need to repeat these steps.
Step OneFirst of all you are going to need "save your profile" so that GG has a record of any save files linked to your PSN Account.
Image One - http://i6.photobucket.com/albums/y224/l ... esign1.pngAs you see in the image, on the right side of GG it shows "Profiles".
I have my saves set to a profile called "MY PS3".
There are a few saves there with no profile assigned to them, these are from another PS3.
Step TwoOnce you upload one of your own saves to GG, right click on it and select Extract Profile.
Image Two - http://i6.photobucket.com/albums/y224/l ... esign2.pngYou will get the following box open up.
Image Three - http://i6.photobucket.com/albums/y224/l ... esign3.pngIf you have no profiles already set you'll be given one called "Profile 1". Right click it and select "Rename".
Name it something to do with your PS3 Account. Either "My PS3" or maybe your PSN Username.
Once you have chosen your name, tick the box next to it and select Apply.
That will apply that profile to any save from that PSN Username.
Step ThreeIf you have put somebody else's save onto your GG it will not be assigned a profile.
Follow 'Step Two' to assign a profile name to it. As you will see here I have assigned somebody else's save the name "FRIENDS PS3"
Image Four - http://i6.photobucket.com/albums/y224/l ... esign4.pngNow on the right side of GG you can see it shows which Save Files belong to MY PS3 and which ones belong to my FRIENDS PS3.
Now once you have your profiles assigned, you will want to Right Click the save file you wish to Resign.
Select "Re-sign..."
And then select the Profile you want to Resign it to.
Image Five - http://i6.photobucket.com/albums/y224/l ... esign5.pngAfter selecting "MY PS3" or whatever you assigned YOUR profile to be, apply the Resign.
That should do the trick. You should now be able to load the save on your PS3.
Note: Sometimes you may get an error message that the profile isn't yours and that you cannot load another users save file.
In that case you may need to retry these methods again.
It could take a few times to work.
If you still get issues with it, post in the support section.