To simply change the name of your blog:
- Log into UThink and select your blog from the dashboard
- Go to Preferences > General
- The first field is your blog name. Change it according to your heart's desire, then click Save Changes
- Now re-publish your entire blog site.
It might take a couple weeks before search engines update their results for your blog.
If you also want to change your blog's URL, I have another blog entry on that topic.