The training you're participating in may or may not include IRC support. For those of you who haven't used IRC before, IRC is basically an internet chat room, and it can provide a nice back channel during the course of the training where the students and the mentors can all discuss things in small groups without disturbing the other students. It can also be a great informal way to ask questions and support other students.
There are dedicated desktop applications for IRC and I would suggest looking into these eventually. You can also access an IRC channel immediately in a browser by going to webchat dot freenode dot net. And what you do when you get to this page is you fill in a nickname.
I'm going to go ahead and put in mine. The channel name -- now your mentor training may use the Build a Module channel. In which case, it will be hashtag buildamodule, but you may want to check with a mentor to make sure this is the actual channel.
Go ahead and fill in the captcha information and click connect. Once you're in, you'll see the channel name up here. Now you can belong to multiple channels at once and then you'll see your nickname along with the list of anybody else who has joined that channel to the right.
This main area here is where you'll see the conversation and you can participate by using this box at the bottom of the screen. I'm just typing in a quick note and hitting enter and you see that it shows my name ...