How to delete chat history on SKype on my windows 8 laptop?

I have been trying to delete my chat history on Skype for about 8 hrs now and its becoming highly frustrating.
I have a Lenovo Yoga Pro 2 if tht helps and I don't know if Skype was updated or not but there's no settings button nor is there a tools button.

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Skype Support.
The following questions and answers will help you find your history and show you what you can do with it. See How do I delete my conversation history? https://support.skype.com/...%20history

Bassman1