[RMMV] YANFLY QUEST JOURNAL LUNATIC CODING HELP?

http://www.yanfly.moe/wiki/Quest_Journal_System_(YEP)

Can someone help me with the lunatic code in yanfly's quest journal plugin? Basically, under the settings for lunatic, I want to be able to place my own background. But following the example shown within it has proven to not be of help to me. I cannot quite understand where it is referencing, or if there needs to be further code. I simply want to use the image 'pic_3' that is in my picture folder.

Also, I wanted to know if I could use Arisu's notification plugin code for any of the lunatic code that is meant to automatically update the player when they get a new quest or complete one?

https://arisusdollhouse.itch.io/notification-window