When asking this question titled "How do you reposition a background custom watermark image in Microsoft Word 2013" I get the message "The question you're asking appears subjective and is likely to be closed." Why?
Because it starts with "How do you". Often, this could be considered subjective. Like: "How do you like your waffles?"
Maybe replace it with "How to…" or "How can I…".
I like mine with maple syrup, for example.