How to Join a Chat Channel:
You can join chat channels in SWL by typing /chat join channelname
After you have joined a chat channel, you can open a new tab for it in your chat screen by pressing the + in the top-right corner of your chat box, then select the chat channel from the list that comes up.
You can have multiple chat channels appear in the same tab. To do this, right-click on the chat tab you'd like to add to, then select 'Subscribe Channels', and click the chat channel you wish to appear in that tab.
You can also switch between which channels you'd like to talk to (if you have more than one channel on one tab), by right-clicking and selecting 'Talk To' and then the chat channel you wish to talk to.
The SWLRP Channel:
The SWLRP chat channel will be present at launch, and called (you guessed it) SWLRP. It is an OOC channel: all out-of-character chatter, whether it's about SWL or not. You can use this channel to communicate and talk to other roleplayers, ask where people are, arrange meetups, etc.
You can join this channel by typing /chat join SWLRP
Other Helpful Channels:
You might also consider joining these channels as well:
Sanctuary - An OOC, newbie-friendly chat great for all topics.
Noobmares - Help and groups for relaxed, friendly, and new-to-nightmares players. They also have a forum and a Discord chat.
Event - Only active during special events (like Halloween, Anniversary, etc.). Great for coordinating and getting information.