I need instructions for NUSD operation.

There are 5 check boxes at the bottom of the program NUSD.

"Pack -> WAD" is self explanatory
"SaveAs" is self explanatory
But what is "Delete Contents"?
And what is "Ignore Ticket"?
And what is "Local Files"?

I'm not 100% sure about these but,
"Delete contents" removes the individual parts of the 'unpacked' IOS/System Menu/Channel/whatever after it packs the WAD.
"Ignore ticket" ignores the ticket that you'd get when downloading content (not sure what this means though).
"Local Files" means the files are stored on your disk locally.

Delete Contents - Delete the contents after the WAD is packed
Ignore ticket - Doesn't download the ticket
Local files - If the files NUSD should download exist in the correct location on your computer, they won't be downloaded again (useful if you downloaded before but forgot to pack to WAD)