Please keep in mind that Thunderbird is provided for free. This support forum is also provided for free. The persons staffing this forum are volunteers who give of their own time to help others. If you need personal support, I suggest you hire a PC consultant or use a fee-paid email application, or rely on your web browser for email, not using an email client. The last suggestion - just using a browser - may be your best strategy. OR, you can describe your problem and someone here may have suggestions for you. Thank you.

https://support.mozilla.org/en-US/kb/thunderbird-faq#w_where-can-i-get-help-with-using-thunderbird is relevant.

It would help to provide the information previously requested in https://support.mozilla.org/en-US/questions/1490405 and https://support.mozilla.org/en-US/questions/1492806