So, if you have a Gmail account, then commenting or following is easy. When you go to the Along Came the Bird homepage, look at the little toolbar on the very top of the page. On the top right, it says "Sign In" - click it. There, you can sign in with your Gmail account, just as if you were logging in to your email. It will take you to a page that says "My Dashboard". Then, if you type in the Along Came the Bird URL again, and look at the top right again, now, it will have your email and a "Sign Out" button next to it. Now you can comment or follow using your Gmail account.
The other option, if you don't want to make a Gmail account, is to make a Google account. It's essentially the same process, but you use your normal email address, and replies to comments or comments made after yours are sent to your normal email instead of your Gmail. You can make a Google account here. After making that account, just follow the exact same steps given above to comment or follow the blog.
So that's all you have to do to comment! If you still have questions, you can comment and ask her, and I'm sure she'll at least attempt to answer! Just kidding...mostly.
Have a good week!