For most of our newer e-book products, you can open up the file directly via your iPad's safari browser.
Here are instructions: http://www.wikihow.com/Read-PDFs-on-an-iPad
For some of our older products, a computer is required to transfer them over to your iPad. This is because the file sizes may be too large for Safari to handle it directly or the files may not be iPad optimized.
You have to download the file to your computer first and then transfer it via iTunes.
All products we sell are contained within a zip file. Open up the zip file onto your computer to reveal the PDFs inside.
Now you can transfer the PDF to iBooks.
Here is how you transfer your PDFs to your iPad: http://www.dummies.com/how-to/content/how-to-transfer-pdfs-to-an-ipad.html