lucy24 - 9:15 pm on Aug 24, 2013 (gmt 0)
I think you may have misunderstood what the "parameters" feature is for.
#1 a "query string" is the part of an URL after the ? If there is no question mark, the URL has no query string and the parameters area does not apply.
#2 within the query string, each separate named item is a parameter. So in
the whole element "this=123&that=456" is the query string, while "this" and "that" are parameters
#3 Some parameters affect the content of a page, for example
might create a page showing hotels in Atlanta. Others just change the way the content is displayed, like
Right here at WebmasterWorld, each forums page has a parallel form with a parameter called something like "printfriendly". Again, no effect on the substantive page content, it just looks different.
The purpose of the "parameters" feature is to tell the search engine which parameters make a difference. Most of the time it can figure out for itself but sometimes you have to correct it. On rare occasions a parameter will show up that you don't even use; this comes from following links that might say "open in a new window" or similar. Nothing to do with your page, so make sure the search engine ignores it.
If the "parameters" feature in webmaster tools is empty, it almost certainly means the robot has never found any parameters.