Step 1: We open itunes on our computer and then we connect the Iphone6 plus phone to the computer and we click on the "Edit-Preferences" command in itunes to enter.
Step 2: After we find the "book" in the open window, we click on the "OK" button inside.
Step 3: Okay. In the pop-up database we will see a "book" category, and then drag the PDF ebook from the computer to the itunes edit box.
Step 4: And then, as shown in the picture, if the Apple phone is connected to the computer, it will see an "IPhone" button in the upper-right corner.
Step 5: Then we switch to "book"-"Sync book" and then click the "Apply" button.
Step 6: OK, then a "Erase and sync" button will pop up. Then itunes will help us finish the rest of the import work.
Step 7: OK import finished, we in Iphone6 plus ibook, you can see just imported PDF ebook.
All right, here we are, and you'll see this in my book in Iphone6 Plus.