If you want to regularly notify someone when you update your blog, go to the "Setting" tab and then select "Email & Mobile."Enter the email addresses of the people you want to notify in the "Email Notifications" text entry box.
To share a single blog entry once, click on the entry's title to go to that entry's url. Then select the "Share" option from the Blogger menu at the very top of your screen. This small screen will appear:
Select how you want to alert them.