Method 10 Wiki's

I found this exercise rather challenging. I added to the Favorite Vacations wiki but unfortunately, I ended up adding it twice.  I cannot figure out how to eliminate one of them.  When I try to edit, nothing appears in the edit area.  I have a feeling that I need to practice adding to wiki's to avoid this in the future.  Wiki's can be used anywhere in the library and the library community to share information and ideas.  The list of uses would be endless.  In a system with library branches, it could be the one area that youth librarians could share ideas for programs.  It could be a book club for teens or adults.   Everyone is so busy these days, a discussion could be had on the Wiki.