With your Google Chrome web browser, go to the page you would like to screenshot
Open the extension and choose "Take a screenshot" . The extension will then display a preview of your screenshot.
You have three choices:
Validate the screenshot as it is
Crop the screenshot. To do so, simply hold and drag your mouse to create a rectangle defining the portion of the screenshot you would like to keep.
Go back to the mainmenu
The only thing else you need to do is to rename the screenshot (if needed), choose the sub-category of the documents section where you would like the screenshot to be saved, and add a note (if needed).