Once you have finished crafting an Update you have a few ways to share the Update; email, PDF, and link.
To share via email, you will want to start in the Update editor. From here, you will want to click the "Send" button in the top right as shown below:
From here, you will be able to type in email addresses or Visible contact lists in the "Sending" tab as shown below:
After you have your desired contacts and lists ready, click "Send" and your Update will be sent via email.
Be sure to check your engagement stats after you publish your Update.