Once installed, it is accessed in the dashboard under "SEO & Statistics". Specifically, it is located at:
It is very simple. When you first go to the analyzer, it simply shows an empty text field. Here, simply enter the full URL for the page that you would like to analyze!
Once you press "Analyze", the page will re-load (please allow a moment or two for this), and a tabbed interface will display below with the results.
If you wish to analyze a different URL, simply change the address in the text field, and press "Analyze"! Simple!