Yes post that code in your theme’s functions.php file at the bottom and save it and it should add the field to your mappable fields. It may take up to 24 hours for the option to show in your Inbound Form field mapping area.
We are working on improving the process to make it easier. But it won’t be ready for a couple of weeks or so.
I understand that having a Captcha field may hurt conversion rates slightly, but why not at least make it optional for Inbound Now users? I just installed your plugins and started playing around with them, and I really like what I see – and want to sign up for premium features.
However, unless there’s a way to use Captcha or any other resource to mitigate spam, I won’t be making the investment.