The first drop down menu will allow you to select between a few options. If you know the title, "Title begins with" is the best option. For a browsing approach, try "Title contains all words".
Use the second drop down menu to pick a subject area. You will see a subdivided list of subjects to choose from.
If a resource you need is not available through the Libraries' electronic resources, you may request it and it will be sent to you at no cost.