The WP EDU Checklist plugin that you installed in your WordPress website is equipped with a screenshot button for each section. Follow these instructions to take your screenshot:
The following options are meant as a backup just in case you can't get the screenshot button to work in the WP EDU Checklist.
The awesome screenshot add-on is available for Firefox and Chrome. This add-on allows you to take full-page website screenshots, instead of just screenshots of what is visible on the monitor. Here are the links to the download/installation pages: