These help sections will let you discover all the features you can use in Playepub.
To get started you will need one or more ebook files.
Supported file formats: .epub, .fb2, .mobi, .prc, .pfb, .azw.
You have to copy them to your device or SDcard as with any other file. In your BB10 device, Playepub will also be able to open your book files in your Dropbox and Box accounts if you have them configured in your device or even from your computers connected with Blackberry Link.
If you already have some epub files, copy them to your device, otherwise you can start downloading books from network libraries.