Three people have tried to comment to posts but have either lost what they tried to post or were unable to sign in.
To establish a google account go here to create a google account. If you have gmail, you have a google account-just use your email address and password to sign in.
Once you comment on a post and use the little pull down to select the google choice, click post comment. You will be then prompted to sign in. Another way to do it is to sign in in the top right hand corner as soon as you click into the blog.
Hope this helps.