I don’t know how to enabled nested on answer like your system:
Of course in default wordpress settings I have yet enabled this feature.
I think you need settings permission in the Dashboard > Q&A > Permission tab to allow user can post a comment.
In case, you want to change the style of the button, please let me know, I will help you.
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replied 7 years ago
Please send me username & password of your site(via private answer) I will check and help you resolve it.