How can I exclude content within pages from the search? Or specify certain content to be included in the search?

AddSearch detects automatically the main content in your pages, and indexes only that main content. This makes the search results better, as superfluous content (such as sidebars, headers, footers etc.) and duplicate content is not included in the search. Sometimes you might want to manually make sure that certain content is included in or excluded from the search. You can insert tags to your pages to mark such content. See full instructions on Including & excluding content.