I would recommend reviewing this thread to find your previous post. I did a quick review and you are showing multiple unanswered questions pending. After reviewing each of your threads, click on the "Select as best answer" button on the bottom right hand side of the post to select what you feel is the best answer.
Thanks for your reply. I am able to find my threads, but not able to select best answer. I continue to receive E mail that asks me to select the best answer. It seems I am not able to grasp how the forum works. I am a new user member and will try to master or at least learn the basics of forum use. Thanks again for your reply.
Only threads that are created as 'question' type threads, will have the option to select a best answer. Threads that are created as a 'discussion' type (such as this one), don't have the option to select a best answer. So, it depends on the type of thread.
It's also only an option to the creator of the thread. If you didn't create it, you can't select the best answer.
The email will be referring to a specific thread that you created. That thread must have been created by you, and a question type thread. You can select the best answer, by clicking the best answer button, located on each post.