Your Blog title is the title that will appear at the top of your blog site in your viewer's tab in their browser window. This will also be the title that will appear in Google if your blog page is indexed separately from your main website.
You can set the title for your blog by going to the settings section of your blog control panel.
From the general tab you will see a blog title section near the top of the page, and you can type in what you want the title to be. By default it is your company name on your account, but you can change this to anything you'd like. It is best a good idea to enter your company name along with the area you serve and the specific type of business you are in. For example, "Example Photography Blog - New York City Wedding Photography."