To edit most elements within the course, you must first open the element and then click the gear in the upper right hand corner. You will notice that you have the option to check permissions, edit or delete the item. (Some elements may also allow sharing to the library.)
When you open a folder from the course tree, you will notice that you have the option to view the items within the folder. You may also alter permissions, edit, or delete elements using the icons to the right of the element.
When trying to edit elements that may be added to the library (pages, files/links) you may notice a change in functionality. After creating a page, it may appear as though you cannot edit this page. You will notice a link icon next to the author’s name. This link means that the page is linked from your personal library or someone else’s library.
You will then notice that the original page will open up in the library. And you will have the ability to edit the original.