Using In-Line @mentioning (in the Content Editor)
To @mention someone while you are typing in the content editor, type the @ symbol (or click the @ button if it is available). A search dialog opens and suggests possible matches. To narrow matches, use an underscore (_) as a space. For example, @Mike_D would match the Mikes whose last name begins with "D." Select the correct match from the list and note the new link in the content editor. For more about @mentioning, see Shouting Out to People, Places, and Things.