After iChat is open, I click the menu named 'iChat', inside it says "log into firstname.lastname@example.org" (which is my Apple ID). I've clicked on that item but nothing else prompts me for a password afterwards.
The buddy list still says 'Disconnected'. I am using Leopard (10.5.8). I have changed my password before, but I'm never prompted to actually log in and update it.