This is shorthand for saying that it's a World Wide Web site, accessible only with a Web browser. If you can determine the Web site host, connect to the host and follow your best-guess links to the file you are wanting. Watch other sources for announcements of Web site address changes. Web Masters use Newsgroups or Discussion Lists quite frequently in announcing changes to the population assumed to be most interested in the sites. Most search tools provide a box to enter the search topic, and a button to submit that topic for processing by the search engine.
Many search engines provide both beginner and advanced versions.
Sometimes the advanced version provides a user friendly form with pull down menu options which is a more effective way to search. Search engines are usually searching pages in the index that are hours to months old. Therefore, some links retrieved will lead to dead ends. Generally, the older the indexing date, the greater the risk that the page no longer exists. Read the instructions and look for links to further assistance.