Thunderbird: форум сообщества

My ISP has made a change for "third-party" accesses to its e-mail (which still works fine on its own website e-mail access page). I need to check my Username, Password, SSL, Protocol, Incoming & Outgoing Server Ports. BUT I don't see on my Thunderbird page where to find these: it's my preferred way to do e-mail! Where are they??

I added a new mail account and then after a week or so decided to remove it. But after removing it I kept getting a popup nag to enter a password for the removed account.