being new to all this I am asking for help. I am using Ubuntu 16.04.1 and email via thunderbird mail (unknown version, how do I find this) I am receiving emails quite normally but when I try to send them, I am asked for a password. This has happened suddenly, I have an email password but it tells me it is incorrect. I have tried Googling help, but the first step is : Go to tools > open account information.?? This is where I crash, under tools there is no account data on the drop down box. BOTHER.... Please help in simple steps please.
Thunderbird is prompting for a password because the saved password you have (if you have saved a password) doesn't match the password that is associated with your email account.
The password for reading and sending email is almost always the same. If you recall the password you used for reading the mail, use that same password when Thunderbird prompts you for the sending email password.
If you don't recall the password, or it doesn't accept the password you typed in, you'll have to contact your Email provider and get the correct password.
Your email provider may not be able to tell you your current password. But they will be able to change it to a new one of your choice. Use the new password they give you for both reading and sending your emails.
By the way, if you are having a problems using Google that is a separate and unrelated issue. You can create a separate question to fix your Google problem.