[amibroker] how to plot buyprice at chart?

[rink]

Hello all
please tell me how to plot buy price at chart
suppose i use  this formula(look below) and it gives buy signal at 55 
for symbol abc now i want to plot 55 on chart
please tell me
thankyou



bk= MA(C,100);
zz=c>bk;

Buy = Cross( EMA( Close, 10 ), EMA( Close, 252 ))  and  bk ;