(A) How to join a custom channel (the "LFG" channel in this case)
1. Press "ESC"
2. Scroll horizontally to the right until you access "Chat Options"
3. Find the line that reads "Join/Create Custom Channel".
4. Enter "LFG" in the field
5. Click on the Join button beside it.
6. You should see the LFG channel appear at the bottom of the screen under the heading "Custom Channels"
Below is a screenshot showing the details.
(B) How to chat in a custom channel (the "VLFG" channel in this case)
1. Press Enter
2. Hold down
3. Type in a message and hit enter to submit the message.
4. Below is a picture guide (click on the image to view the larger version).