The Google Classroom page

  
 Stream 
 Google Classroom has four tabs at the top of the page. The Stream tab is a list of all the activities in the class. This includes messages and resources shared. 
 
 Teachers and students can add messages to the stream for the rest of the class to see. 
   
 Post a message or notice 
   
 
 
 Click Share something with your class. 
 
 
 The box will open up, displaying more options. The main area shown above is where you click and type in your message. 
 When ready click Post to publish your message to all the class member’s Streams. Your message will now be visible to all students.