How to invite others when the meeting already started?

1. On the bottom right side,click  on:
    
2. Click on Add people icon:
   
3. Type the email and press "add" and "Send invitation." 
   
   
4. You can also go to the bottom of the screen and click on this icon:
   
   
   
5. It will open a new tab where you can copy the link and send it to your guest.