Hi, welcome to Creepypasta Wiki! Thanks for your edit to the Jeff the Killer 2015 page.
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Please leave a message on my talk page if I can help with anything!
RE: Commenting Problem
The message you received was auto-generated. Users get it whenever they make their initial edit. Commenting counts towards that. You can leave one on the story (as long as it doesn't violate any of the commenting rules).
Hope this clarifies any confusion.
EDIT: Also, as you brought up, you can leave a message on the author's talk page for a more direct approach. Either way will work though to get their attention.