In order to be able to comment on SGL you must have a valid login. If you do not have a valid login you can register. It is easy. You only need to enter a username that you would like to use and your email address and a password will automatically be emailed to you and you can log in and begin commenting almost immediately. “How do I register?”, you ask…
Simply scroll down until you see the META section in the lefthand column and click LOGIN. You will be prompted from there. Or you can even more simply choose REGISTER from the top menu.