Luckily, this is one of the few things you can delete on italki. Go to Notebook (http://www.italki.com/notebook) Then go to My Notebook (http://www.italki.com/notebook/mine/notebooks?page=1) You will see a list of all your Notebook entries. To the right of each entry is a trashcan icon. Click the trashcan icon to delete the Notebook entry. As for anything else on italki which I can't delete... well, it reminds me to think before I post. ;)