How to clear chat history in yahoo messenger

The Yahoo messenger service is a chat service which users can use to chat, real time with any of their contacts. Apart from that, users can also see the current status of their contacts (online, busy, offline etc.) and ping accordingly. By default, chat history gets saved for each and every conversation but customers can manually delete the chat history by selecting the chat transcript which they need to delete, and then click on the delete button. Apart from that, users can also make changes to the settings option which would then automatically discard chat history, and would not save them.