Since Stonewall Fleet spans multiple in-game fleets and across factions, we use the StonewallFleet channel as our main chat channel. This allows all of our members to communicate with one another while playing regardless of which character they're currently using. We use this channel for organizing missions, answering each others questions and just generally chat.
To join the StonewallFleet channel, type "/channel_join StonewallFleet" into the input field and press enter. This will add the channel to the current chat tab. To send a message in the StonewallFleet channel, either click where [Local] is displayed above and select the channel or type "/stonewallfleet message" and hit enter.
To add a new tab and configure it, right click a chat tab, such as Chat or NPC in the above photo, to open the Chat Configuration window.
Only the selected channels will populate this tab and be options in the channel select. You can also change channels and send a message using the "/channelname message" command.