If it's your first time running Thunderbird, you'll be greeted with the following screen
You'll want to enter your Email address and password and then click ‘Configure manually’
Enter the incoming and outgoing server settings as shown in the image.
The server settings should match what's displayed on our Email wiki page
Once you click ‘Done’, it should display the account with your folders in your Inbox. It will download all of your emails by default.