Choose the backlinks button, check off the search engines you want to search, put in the keywords related to the sites you want in the small box and hit the button with the "H" on it in the upper right hand corner. It will take a few minutes, but there will be a list of urls returned that have your search terms in the site.
The middle button will stop the search. The bottom button will export the urls into a text file.
This is a newer version than what I am use to using, so the rest of the buttons in the main program, I don't know yet.