First, on the library website, enter your title or author in the Search box. The default Search is set to search the online catalogue: 
Then, once you are in the catalogue, you have more search options available to you. The default catalogue search is by 'Keyword,' but you can also search by Title, Author, Subject, Series etc., by selecting the best option in the drop-down menu. In the example shown below, a keyword search of an author's name will result in all titles by the author, about the author, or related to the author in some way. In this case, it would be better to 'Search by Author.'
There are many ways to narrow down your catalogue search, and our staff are happy to help you. Please ask us!
Here's a great article with some search tips from our librarians: How to Find Available Titles in the Collection