[Pro Sites] [Pro Sites] Setup Your Site Form

After choosing a subscription level a "Setup Your Site" form appears. 1.) It look aweful, and 2) We would like to add more form fields (questions) to this form.

1) Where would I go to access this form and style it and add more form fields to it?

2) How would I hook into this form so that I can send it's information (webhook) off to a differet database (customer management backend)