I am sure that Kristen (Ladybug Teacher) has probably done a fabulous tutorial about this, but I'll give it a shot!
I received a comment asking how to leave a link to your blog in a comment.
You will need this code:
Copy the URL to your blog and paste it in the place of URL in the code.
Type the name of your blog in place of Name of Blog.
I typed mine in as a post, but I didn't publish it. Here is a screen shot of what it looks like. I just copy the code from here and then paste it below my comment.