For accessing the editing option, please send the e-mail address you used to set-up your google account to firstname.lastname@example.org. An email from Dr. Madou will inform you then that you have been added as an editor and that you can enter your comments. Please click “Add item” and fill out your name, e-mail, date, affiliation and list the page number in the chapter where you found an error. To describe the error you can either use the Issue entry feature, attach a file or write a comment. If no “Add item” icon appears on the top of the table, please sign in on your google account following the link at the bottom of the page.