- If you haven't already done so, install the iBooks app on your iPad or iPhone
- On your iPad or iPhone, click the download link for your ePub. Depending on the shop, this could be in an e-mail receipt or on a download page you were directed to after buying your e-book
- Select the option Open in iBooks when prompted
- iBooks will launch and open your e-book, as well as add it to your collection
Your e-book is now available to read from your iPad or iPhone whenever you like, just by opening iBooks.