You need to set up bitlbee to connect to discord. First you'll want to create a local bitlbee account. Click the "localhost" server near the bottom right. Then click on the &bitlbee channel. Here you can enter commands to set up your account.
Code:
register yourpassword (this will create a bitlbee account with your current username)
account add discord youremail yourpassword (use whatever your discord account is linked to)
account discord on
chat list discord (this will list all the servers and channels you are subscribed to)
(scroll through the list to find channels you want to add)
Say for example mac-yak general chat is #13 in the list... you would add it like so..
chat add discord !13 #MacYak-General (or whatever name you want to give it)
Now make it autojoin that channel on login..
chan #MacYak-General set auto_join true
save (this will save your current config)
/join #MacYak_general (will join the channel)
Continue the above process for all the discord channels you want.
Now next time you log in to bitlbee all you have to do is type:
identify yourpassword and all your discord channels will be autojoined. It takes a little time to set it up, but once it's done you'll never have to go through this process again unless you want to add more channels, or join more discord servers.
Cheers
EDIT: here's a tip... you can grab and drag the text input box down to the bottom so it only shows 1 chat window. It's less confusing that way i think.