How to use wii game nkit.iso with usb loader

Hello,

I've download some Wii games with nkit.iso , before to put them in WBFS Manager, i convert the file to ISO Wii Backup Fusion and when i add them with WBFS Manager to the USB, the size of the file in the USB become 0 (the Iso is with good size)

I've another game in USB that works

So what is the process to add the game with nkit.iso to USB ?

If i download the wbfs file, what's the process also ?

I don't find the tutorial in the faq section

Thank's for your help