logic captcha field is not display on the contact form, and can i add an i frame to display google p

Hi, I tried to add logic captcha in the contact page, where I have followed the following steps, 1. Added new field (Data type: text). 2. Form Control (Logic Captcha). 3. Requires yes and i click save and moved to contact page where already one text area and one text box are displaying when i hit refresh i didn't any change, and one more thing is I would like to add the iframe of google location can any one help me out of it, thanks.