Setting up Thunderbird to connect to your mail via an IMAP connection.
When you first install Thunderbird you will be asked to setup an account. The screen shots below are samples from that setup process. If you have already conpleted the setup process but would like to add you Oneonta accout to Firebird, then you can access the setup wizard by choosing File->New->Account.
If you need to make any changes click the Back button until the screen that contains the information you need changed is displayed. After clicking finish a listing of folders will be displayed.