If you don't have a U mail address. you can create an email id from here then you can U email login.
Open Thunderbird Software App. Click on Email
When you click on the email, pop-up Set UP an Existing Account Screen.
Enter Your name, U Email address and Password then press Continue.
Click on the Manual config menu at bottom.
Enter Below U incoming server settings.
In incoming click on the dropdown menu and select IMAP.
Add server host :imap.gmail.com
Port: 993
select SSL/TLS
Enter Below U outgoing server settings.
In outgoing select SMTP.
Add server host :smtp.gmail.com
Port: 465
select SSL/TLS
Tap on Done. Now you are ready to use your U email account on your Thunderbird.