add more button on answer "Not accept this answer"

Question

My users not like when he post a question and someone answer it and this question fall  down in question list even he doesn't  like and think the answer correct and userful.

So he ask me to add more button on each answer  of his question call "Not accept this answer" . And after he click this, his answer go to up at  Unanswered Tab.

Is this featured possible and thank for help me modify step by step.

Thank you.

Comments

Personally, I'd like to know how to just add a button to the answer 'edit comment hide' within the custom theme template.
Such a headache over what is possibly a really simple answer.

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https://www.question2answer.org/qa/30002

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AFAICS the answer a lot less simple than you seem to think, b/c it doesn't just involve adding a button. The desired behavior would require Q2A to suddenly treat a question with an answer like it didn't have an answer in the first place.
Besides, questions with no accepted answer already remain in the Unanswered tab, just not in the "No answer" subsection. You find them in the "No selected answer" subsection instead, which is 100% correct.