I think I read all the replies to your question about the Williams %R technical indicator, but am not sure. Therefore if I am repeating something someone else has sent to you then I apologize for being redundant.
On the StockCharts.com website at the top of the page you can find their "ChartSchool" between their "Free Charts" tab and their "Blog" tab.
When you click on the Glossary it will take you to a page where you will see that they have arranged an explanation of each of the technical indicators alphabetically. Go ahead and click on the "W" near the top of this page.
Scroll down that page of the indicators beginning with the letter "W" and you will come to a paragraph which gives a brief explanation about the Williams%R technical indicator. At the end of the paragraph, you will see where it says "See ChartSchool article on Williams %R". Click on "Williams %R" in that sentence and this should take you to an article with a complete explanation of this technical indicator; how it is calculated, explanations of use, etc.
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