I believe it appears until a number of posts have been made, I forget the threshold (I'll have to check that). There is also the "Resource" box on the right sidebar/panel that highlights a random resource. Any other ideas will likely not be any sort of flashing or sparkling highlight with words like "Go see the resources" because even if those were more effective they are not "professional" or something. We can only suggest perusal and not force it, unfortunately. Users are likely to continue to ignore many things that stare them directly in the face, and they'll make another repetitive post asking the same answered question(s).
UPDATE: The condition for the message appearing is: $visitor['message_count'] < 15

<<-- How it appears (highlight not included).
Does the message need to be larger, different color background, any other garishness to be seen more, or should it stay visible permanently or a different amount of posts? The concept is fine, it has been in place a while now. If it is ignored, it may be possible to make adjustments but something like moving it to another place on the edit box page could be more involved.