unlike some other chat windows, this one you dont have to download anything to use it.
Step 1: Opening the Chat Window
Pic 1: open chat window in bottom right corner
Pic 2: Click Options
Pic: 3: Click Pop Out Chat
Step 2: Pop Out
Click on the person you want to chat with on the left side of the screen. It will have there picture and their full name, but I need to protect my friends. Down at the very bottom it has all the people you are talking to, you type in the little row, and it shows your conversation in the big main box.