E-file - under section 119(2)(b)

I HAVE NEVER FILED RETURNS IN PRIOR. AND NOW I WANT TO FILE THE SAME. I READ FEW ARTICLES ABOUT FILING THE RETURN U/S 119(2)(B) AS WE CAN FILE UPTO 6 YEARS. I TRIED DOING THE SAME ON ITR E-FILING WEBSITE. BUT UNABLE TO GET THE ORDER NO# AS HOW AND WHERE TO OBTAIN THE ORDER NO AND DATE TO FILL THE FOR ONLINE FORM. HENCE IT WOULD BE GRATE IF ANYONE COULD HELP ME ON OBTAINING THE ORDER# PROCEDURE.