You don't need a Google username and password to make comments on the posts. To add a comment click on "comments" at the bottom of each post. A pop-up showing the comments already made with an input box to add your own comment will appear. After Word Verification ignore the Google Username and Password boxes and select "Name/URL" instead. A box will open where you can enter your name or pseudonym and then publish your comment. All comments are moderated and therefore may not appear immediately.