In order to edit you must first log in to the LIbretexts AND have an account that has editing capabilities. Sign in to the library by entering your credentials in toolbar below the list of libraries. If you do not have an account or if you have forgotten your password hover your over the "door" symbol next to the sign in button and select to either sign up or have a reset password link sent to you. After you log in you should see a black bar with several editing options appear. If the bar is grey after you sign in you do not have editing capabilities, in that case you can write email@example.com to request your permissions to be updated.
Once you are logged in with appropriate permissions you can now navigate to the page you want to edit and press "edit".
The Mindtouch platform we are using for the LibreTexts uses a modified CKE editor that allows for module construction without having to build/edit the raw source (HTML) code directly. The CKEditor is a ready-for-use open source WYSIWYG text editor from CKSource designed to bring common word processor features directly to web pages, simplifying their content creation. It has been configured for most of the needs contributors require. The layout is below; please refrain from using the advanced features in red until you are familiar with the Mindtouch structure. The Toolbar is the section located at the top of the editor window. It contains menu buttons that give you access to various functions of CKEditor. All buttons are grouped according to their function and include both simple operations (like basic text styling or formatting) and more advanced features (like inserting media or forms via a dialog window).
Figure: A simple layout of the Mindtouch CKE editor without labels. Buttons labels in red are advanced features.