i've install gsx ground service but nothing appear on the big airports
GSX works with each and every airport, regardless of its size. In fact, it works better on "big airports".
Of course, is not possible to help you in any way, which such generic description of the problem. What do you mean with "nothing appear"
Nothing appears automatically in GSX, you must call it with its hotkey. Have you read the GSX manual ?
Please, clearly indicate what you are doing, and what message / errors (if any) you see on screen or, if you don't see anything, clearly indicate what you are doing to use GSX and what happens, exactly.