Simply by adding the {JFBCLike} or {JFBCShare} tag, it should work. Our JFBCSystem plugin automatically scans each page and will replace those tags with the proper ones. Since you are using Kunena, which allows for users to post their own content, we'd recommend going to the JFBConnect admin -> Social -> Misc area and setting the Admin Render Key. That's a special setting that will require a code to be used with each tag.
For instance, if you set the Admin Render Key to "abc1234", then the tag you add to the Kunena template files would be:
{JFBCLike key=abc1234}
Without that key, the social button will not render. That helps prevent your users from arbitrarily adding their own social buttons if they realize you're using JFBConnect.
I hope that helps explain further,
Alex