So, I tried to use the PPD Editor help button... And it didn't work - there was a webpage that said something like "can't find the webpage", so I'm assuming that the link is outdated, or something like that. Can someone direct me to a functioning help link? Thanks in advance.

PPD help is only in Japanese and Korean.

Refer to help in the KHC folder and translate it.
Or ask KHC Master for an English translation.