What is a clean URL?
How to do
1.
Visit a page you want to give a clean URL in the left side of admin.
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or you can type in the url directly in the input
2.
Type in the clean URL you want
3.
Click Create a clean URL button
4.
You can check the list of your clean URLs in the List of clean URLs tab.
Check out the video guide.
Tips
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You cannot create a clean URL of a root page.
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Lowercase alphabet letter and two special character(-,/) are allowed.
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If the way of creating clean URL above is cumbersome, you can create clean URL with 
Head YAML Code Block feature.
Head YAML Code Block feature.