Visit ARBookFind.com and choose whether you are a student, parent, teacher or librarian. Once you have done this, you are taken to the search page. Here you have 3 option tabs at the top of the page. You can do a quick search, advanced search or choose "collections".
The default page is the quick search page. If you already have some idea of a specific book title, subject or author, it is easiest to simply type it into the search bar just under the tabs at the top of the page and click "go". You can then scroll through the results. Depending on your search, this may or may not return a long list. If the list is too extensive, use the advanced search tab instead as this narrows the search parameters.
If you have no idea of what you need, click on the collections tab to find the appropriate list. These lists give you titles of books that are all definitely AR books. You have several options such as "awards" and "state lists". Once you have clicked on the collection that you would like to see, the site gives you a list of book titles and authors for you to read.