How send Pagedown sendkey to mainframe Attachamate application

Hi Team,
How to send Pagedown option to Mainframe attach-mate application when i send directly from navigate stage {PGDN} it's placing value in the screen.

Please help me out on this.
 
i used same it's entering {PGDN} in one of the field but i want to change the screen. in my case it's entering the value in present active screen.

it's entering like below.

Policy Number {PGDN}
 
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