Adding customized smartform to VF02

Hi,

I have developed a smartform and a corresponding program for that.When we execute this program it will ask for the billing number and when i give the billing number it will retrieve the values and show it in the smartform.

After the data displayed i can take the print from it.

But now i need to attach this in Standard screen VF02.I went to T.code NACE>V3->RD00 and check in side there is already a z program with sapscript.

It shown as

Program name -->zprogram

FORM Routine -

>ENTRY

FORM -->Zform.

But when i give my smartform name and program name(I didnt give subroutine name,becoz i didnt use any subroutine there).

This output is not dispaying.Can any one tell how to do this