You need to create the Request in the main JFBConnect component. Then, the ID will be visible in the admin area and you can copy it from there. If you haven't already, I'd highly recommend going over our Facebook Requests Configuration Guide which should explain the steps.
If you have any more questions, just let us know.
Glad that got you going. Should you need anything else, just let us know.
Finally, if you haven't already, please consider leaving a rating and review for JFBConnect, or our support, on the Joomla Extension Directory. It certainly isn't required, but is very appreciated:
http://extensions.joomla.org/extensions … ation/7215