Step 1: Google
Make sure you've downloaded iBooks from the App Store first!!!
Step 2: Search
In the search bar search for the book you want !
For example ' the fault in our stars'
Step 3: Select and Download!
Then select the book you want it will open a new page!
The click download ebook!
A new page should open up and click on 'open in iBooks' this saves the book to your library!