How do I get this???

I recently bought FLTSIM4 and I am in a quandry. How does one get the "Squawkbox" to work??. I have tried and tried and I cannot get it to show the "input line".
I am sure I downloaded "SB" o.k. and I get all the inputs working, but I cannot get the "SB line to show the line as it scrolls, showing the messages etc"..
Can some one please help ! !...