The Keyword analysis tool is useful for finding out various keywords related information like keyword density, occurrences in the page, occurrences in the anchor text and the word count of each phrase found. Before seeing any results you should analyze your websites. To do that you need to press the "Analyze websites" button from the upper region of the report
Pressing the down arrow button next to the "Analyze websites" button will show an update context menu with the following options:
Analyze all websites. This will start an update of the current day for all the websites in the project.
Import history for all websites from WayBackInTimeMachine. This will start an update for all the websites in the project that will import from WayBackInTimeMachine all the available change dates.
Analyze selected websites. This will start an update of the current day for the websites selected in both left side input panels.
Import history for the selected websites from WayBackInTimeMachine. This will start an update for the selected websites from both left side input panels that will import from WayBackInTimeMachine all the available change dates.

This panel contains two sections for each selected URL. In the upper section you will see an analysis of the general URL information. The information presented here contains the URL title, IP address, parent domain, page size and a meta information analysis. The lower section displays the words and phrases found in the page text along with the time they occurred in the text, anchors and their densities
The Keyword Analysis tool has two ways of displaying the analysis data. The first is a side by side comparison of two different web pages. To do that, select two different web pages in the left side input panels.
The second way is to compare two different analysis dates of the same domain. In this mode the Keyword Analysis tool will display the differences between the two selected days.
The Keyword Analysis tool allows you to set up various parsing parameters. You can set these parameters by pressing the Options button.

In the Options panel you can specify the maximum number of words in a phrase. You can also specify the maximum and minimum density percent that will determine the coloring of the density column.