The first thing you'll see is a weird spelled word to copy in the box below it. I understand that some internet sites put us through that to protect the site from spam. If you can't decipher it and get it wrong the first time, no worries, they give you other chances.
Now if the Google account circle is checked, uncheck it by clicking on it. Next you'll see boxes for signing up for a google account. If you don't have a g account, or even if you do, you don't have to fill in those boxes--just skip that option, and skip the username/password blocks. Continue to scroll down, and read the final options. If you want your name to show up with your comment, push the button that says: Name/URL. That will bring up two boxes--one to put your name into and the other box says: (optional) which means you don't have to put anything in it, so you don't need a URL or a google account to comment.
Now if you don't want your name floating around cyberspace, make up an alias or mark Anonymous and then, your clever, encouraging comment will be recorded with the others, but your name won't appear.
I hope this explains how to make a comment on a Blogspot Blog. I'd love to read your reactions to my postings. Try it and see what happens. Thanks for listening...xo hugs to all my buddies out there. (See the format just below the blue words "Choose an identity".