Configure Input fields from ATG Dynamo

Hi! I want to create one form with ATG Dynamo,So that i have selected one FormHandler component through ellipse(..)button and form method as a "post". When i click next button the next window (Configure Input Fields)shows fields are disable.How these fields will enable to select the items without hardcoding the forms.I want to select the fields to create the forms automatically without coding the forms. here given images what i did step by step 1. 2. 3. your quick response appreciated. regards, Rams