You just put it in the title folder as explained above "sd/private/wii/(id of the game)"
But to get it to copy over you must do 2 things.
1 - Have already had a save (you can delete it/ move it)
2 - Use preloader/startpatch etc and enable the copy no copy save hack.
I'm fairly sure that's what I did but it was a while ago, let us know how you get on.