question on cancelling a site on reserve america

I would contact the campground and explain and ask if you can let you friend have the other week. Most campgrounds probably don't care as long as they know about it and the site is paid for. If you make any changes or cancellations thru Reserve America, there will be a charge. Do this right away because if you have to do it thru Reserve America, the closer to the date of reservation, the higher the charge to you for changes or cancellation.