Hi Beth and Larry!
To edit your campground review, click on the specific review you originally submitted and you should see the review with your name as the author on the left side of the page.
On the right side of this same page just under the words you typed, you should see as "edit" button which when clicked will take you back to the page you originally submitted.
Make your changes, click the "Submit Edit" button and you're done!
Let me know if you run into any problems.
Dave