How to remove a Yahoo mail folder?

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Hello everybody, I need your help to remove a Yahoo mail folder I created some months ago. When I created it, I thought it will be useful to me for storing some important mails. In the mean time, those mails proved to be not useful any more so I decided to remove them. I deleted all those mails but now I want to delete the folder as well. Can you tell me how to delete that folder? Thank you in advance.