totally blank screen, please help, how to plot on screen

I have modified the code to generate buy sell signals on screen. I cannot post it
without the permission of author.The code is reasonably good, but is giving
more number of buy signals on down trend. signals on up trend are ok.

Hi,

Please do pose.. the code is open source to do anything you feel like..
i am just a novice!

This is a Surgical Strike Strategy or “Shoot and Run” type strategy.
CLOSE ALL POSITIONS ON THE SAME DAY.

DO NOT CARRY FORWARD BASED ON THIS SYSTEM.

Use this AFL on EOD and select your targets. Then on next trading
day (ie, Intraday) Buy if Price goes above High of Buy Signal Bar.
Sell – If price falls below Low of Sell Signal Bar.
hope this helps.

This is how far my learning goes..
pls try this new Modified AFL..
========

_SECTION_BEGIN("Radiosilk's N-Cross Breakout");
Buy = Cover =   ( 
        Ref( Close , -1 ) > Ref( High , -4 )
        OR Ref( Open , -1 ) > Ref( High , -4 )
        OR Ref( High , -1 ) > Ref( High , -4 )
        OR Ref( Low , -1 ) > Ref( High , -4 )
    );
 
Sell = Short=  ( 
        Ref( Open , -1 ) < Ref( Low , -4 )
        OR Ref( High , -1 ) < Ref( Low , -4 )
        OR Ref( Low , -1 ) < Ref( Low , -4 )
        OR Ref( Close , -1 ) < Ref( Low , -4 )
    );
 
Buy = ExRem( Buy, Sell );
Sell = ExRem( Sell, Buy );
Cover = ExRem( Short, Cover );
Short = ExRem( Cover, Short );

shape = Buy * shapeUpArrow + Sell * shapeDownArrow;
PlotShapes( shape, IIf( Buy, colorTurquoise, colorTurquoise),0, IIf( Buy, Low, High ) );
_SECTION_END();