Click on Beta Features from the top left menu

Click Get Started beside Virtual PBX 

Select your phone assistant:

Choose Extensions in the Phone Assistant menu:

Choose + Add Extension:

The extension requires a full name, phone number, and email address. 

Enter Full Name
Enter Phone Number
Enter Email Address

You can give the extension a personal recording, if you choose to.  It is not required:

8. If you would ever like to edit the extension, choose Extensions in the Phone Assistant menu and then click on the extension to pull up the details:

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