Clicking on the "send feedback" link does nothing. How do I actually send feedback to Yahoo mail?

Yahoo is doing something that makes using it for email almost impossible on occasion. I was trying to respond to an email yesterday, when an acquaintance came online. Neither he nor I had requested a chat, but yahoo popped up a chat request box that I couldn't get rid of. Not even clicking on the x in the top right corner would make it go away. As soon as I began typing, it would automatically pop up and the characters I was typing would go into the chat request box rather than the email I was trying to write.

This is no way to run an email application, and Yahoo needs to know about it, but I can't find any way to actually send them feedback, despite the existence of a "Send feedback" button.

Any ideas, anybody?