We have made modifications to enable editing of blog titles registered with Hatena Star.
To make changes to a blog title, go to your Blogs page (e.g. http://s.hatena.com/username/blogs ) and click on the pencil icon next to the title. A window will pop up where you can enter a new title for your blog.
You can only make changes to titles of your own blogs.
In the past, you were unable to change the title you entered once you registered your blog. In response to your requests, we have now made modifications to allow changes to your blog title even after it has been registered.