A chat room allows you to converse with your peers synchronously (at the same time) by typing. You can set up times to meet over email, or it's possible that your instructor may set up a weekly chat time for online office hours. To enter the chat room, click on the words below these instructions: "Click here to enter a chat now".
Once you are in the chat, you can also "beep" each other to get each other's attention. You'll see a beep function on the right, under your name, when you go into the chat room--it can be fun to occasionally beep your peers to get their attention, if they don't have their sound turned off! Too much beeping can become irritating, so use this function sparingly!
Note that in some cases, you can also view past chat transcripts.