There are various ways of putting copyright notices on your blogs including typing your own and if you want to include the © symbol, you will have to use the code to display the © symbol. For clearer explanation, refer to How to put a copyright notice to your blog. This post was written for the old classic Blogger template, but you can modify it for the New Blogger if you know how New Blogger works. If not, refer to the bottom section of this post.
If your blog content has been copied, or you want a way to discourage would-be copycats, refer to this post: What to do if your blog content is copied, or you want to warn off would-be copycats (click BACK button to get back to this page).
Anyway, there is an easier way and a way to do copyright notice which can enable you to keep the copyright notice up-to-date automatically, and that is to use this copyright notice generator: Automatic always up-to-date copyright notice generator. I have used it to generate a copyright notice for this blog: Dummies Guide to Google Blogger. The copyright notice is at the footer of the blog. If you return to the blog next year, you will see that notice updated to year 2008.
I think I will probably do the same thing for my other blogs, including this one.