By default, your blog is public, and can be read by anyone on the web. Make you blog private by completing these steps:
Sign in to Blogger with your Greenwood student account
In the top left, click the Down arrow .
Select the blog to update.
In the left menu, click Settings
Then select Basic.
Under "Permissions," find "Blog Readers" and click Edit.
Select Private - Only blog authors (or Private - Only these readers, if you are sharing your blog)
Click Save changes.