First scroll down to the bottom of the post. If someone has already left a comment on that post - then it will say 1 comments or 2 comments. If no one has commented, then it will say 0 comments. Click on the "comment button."
Then you'll see a box that appears, and this is where you'll write your comment.
Then you click - "Select Profile." It's easiest when you have a gmail account. You'll use that name. If you don't know the blogger to know who you are, then you can choose Anonymous.*
After you've selected your profile, click "Post Comment." If you clicked google account - then you'll see this:
Type in your gmail name and password. You'll be directed to this preview page of your comment.
After you preview your comment, click - "Post Comment." Then voila - your comment will be published.
If you clicked anonymous - then you'll see this page where you have to type in the funky security word in order to post your comment. Click "Post Comment." And then voila - there is your comment. Posted. You could also post a comment under anonymous and then say who you are and not be so anonymous. :)
I hope this post was helpful. If you still have questions or run into a comment error - please email me at chanehart at gmail dot com and I'll help you. :) Happy Commenting.