"In your blogger dashboard (main page) go to Settings, then Posts and Comments. On the right there will be a box labeled Post Template. Just insert the html code in this box. Then your signature will automatically load every time you make a post."
I went to the dashboard, then to Settings. There wasn't an exact "Posts and Comment." Maybe I have an old version or something. In any case, this is what I did. I finally tried going to "Settings." Then under that there is a tab for "Formatting." At Formatting, I scrolled down to "Post Template." I pasted it in there, saved the settings, and voila! There it was.
I know there is a way to get it to be on the old posts, too. With my lack of knowledge in this area and fear of messing up everything, I'm gonna stick with this. Here it is
Now if I can just figure out how to get the signature out of the little white box, I'll be all set. It's a start!