How to move a user's reply into a new topic?

[wenqin]

I once asked a question under someone else’s thread and it was modified by an administrator to a new thread.
Now I want to do the same in my forum. Take someone else’s reply that is not relevant to the original topic and re-edit it to a new topic.
But I clicked every button in the reply. None of them found the right way. Is there a permission setting that needs to be turned on somewhere first?

[Lilly]

If you click the admin wrench in top right corner of the topic, you can then select the reply and move it to a new topic and category.