I want to remove the stored IDs in the "New Conversation" tab of Yahoo Messenger for Mac, how can i do this?

Yahoo messenger for Mac delete "New Conversation" records?

Im using a MacBook Pro (OSX 10.8.2)
The Yahoo Messenger for Mac (Ver 3.0.2) has an option called "New Conversation" under the File tab.
Once you type an ID it allows you to initiate a chat. The negative thing is that it apparently records this ID in the memory so next time you start typing, it suggests the ID for reuse. For Instance: I use the "New Conversation" to start chatting with the ID "inman_78". Next time when i intend to use the New Conversation again, as soon as i type n (or m or i...) it suggests inman_78.
I WANT TO DELETE THESE SAVED IDs and/or disable these suggestions.
Is there anyway to do this ?