To change your blog's name or description, go to Settings | Basic:
The title of your blog and its description determine how your blog will be viewed by others. The title is what your blog will be known as on Blogger, as well as on your page. Try to enter something meaningful (e.g., not "my weblog"). You can leave these fields blank if you don't want them to display on your web page.
Description can be used to describe your blog, or to give a subtitle. A description can't be longer than 500 characters, and can't contain HTML or other code. If you want more content in your description, you are welcome to enter it directly into your template.