Can I delete unread yahoo messages?

I am desperate I need to delete unread instant messages in yahoo Instant messenger

i can't find a way to delete them all at once.

I have tried selecting all, but it selects all my messages, not just unread. I also don't want to sit and single click them all.

I'm not on 'messenger' and I do not know this person. How can I get rid of it?

how can i do the same

I have a basic (free) Yahoo account. The max number of messages that I can mark is 200 since that is the max number of messages to display per page that can be set in options. I have a couple of folders with several thousand messages I want to delete...

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