Google makes it easy to communicate quickly and efficiently right from your inbox. To get started chatting with people within GMail, follow these simple instructions.
1. From your inbox, find the chat window on the left side of the screen
2. Click on the person's name (If you cannot find them listed, start typing the first few letters of their name in the search window just above the list of names)
3. Start typing in the box that pops up in the lower right side of the screen (If no box pops up, the person is not online and the “Compose New Email” window comes up instead)