If we are speaking of the same prompt, stangely enough, I have "Help things get started by asking a question" instead of "submitting a report".
But maybe this is part of your hack (text changed).
If you want to hide this prompt, find in the qa-style.css file the following:
... / ...
and add 'display: none;' in it.
I don't think this css class appears anywhere else in the code, so that shouldn't interfere with other css directive ... and this is a pretty easy way to do it.