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From the Dashboard, click on Settings.

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Commonly-used settings:

To edit blog information (blog title, description, and other settings), select the Basic tab.
To change your blog URL or switch to a custom domain, select the Publishing tab.
To change the number of posts displayed on a page or the way the date is displayed on your blog, select the Formatting tab.
To hide comments, restrict commenting privileges, and set other commenting options, select the Comments tab.
To turn off the blog feed, select the Site Feed tab.
To restrict the viewing audience of your blog, select the Permissions tab.