網站上面的英文說明 Connect your iPhone / iPod touch to your computer via USB-cable.
Drag your files and folders with a mouse to GoodReaderUSB window.
Wait for file transfer to finish.
Exit GoodReaderUSB.
Disconnect USB-cable.
Start GoodReader on your iPhone / iPod touch, go to its root folder, if you're not there already.
Note USB Folders link in GoodReader. Open this link. You should see GoodReaderUSB folder there. Open it. You should see your files now.
Enjoy your files.
If files being transferred are for short-term usage, it's fine to view them where they are. However, if those files are for long-term usage, we strongly suggest to move those files to My Documents storage of GoodReader, which is much safer place in terms of some other software accidentally deleting it.