Yup ... just copy the http address, click on the Link icon above the box ... enter your bit of reference blurb in the first box, click OK ... then paste the http link into the second box ... click OK ... finis.
Don't forget to leave a review of the French and other European campsites you have visited!
The one thing that scares me here is the complete lack of how a roundabout works. Just pick any lane and go round to your exit then just leave...indication is for wusses