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Generally, help pages are written by administrators, but any user may attempt to write them. Help pages tend to be "how to" pages — largely centered on how to use the underlying wiki software — explained in terms of the content of this particular wiki. If you're trying to write about policy, guidelines or page formats, you probably want to create a page beginning with the word Tardis:, such as Tardis:Format for comic stories.
Please make sure you're not creating a help file that already exists by perusing this list of help pages or by searching for a few keywords in your proposed help topic:
Please make sure you're not creating a help file that already exists by perusing this list of help pages or by searching for a few keywords in your proposed help topic: