There's no password for #loisclark. Make sure that you're joining an undernet.org server. You can use us.undernet.org or eu.undernet.org and it will connect to a random undernet server. If you're not sure, try
/msg BriGal Help! (my normal IRC nick). If it says nick doesn't exist, you're not on undernet.

If it opens a chat and I don't respond, I'm probably just away from my keyboard for a bit.