help on SAP script

hi,

I was trying script program for single page. so when I am calling the function 'open_form' ...i mean when i double clicked on it....i was taken to the module page....but i was not able to change the exporting parameters...though I know what to change....also i cudn't get the module code in the program....

**it's like I am kinda stuck after going to the module page.....can someone tell me what am I supposed to do after that.......