Here are the steps to add a new epub title:
1. Log in to your account in Papertrell (http://www.papertrell.com).
2. In Dashboard, Click “Add new title".
3. Select "Import epub" tab >under “import your epub” upload your epub file and choose any template “Classic Blank/Classic Slider/Classic Large Blank/Classic Menu/Vanilla
4. Select “Also create the sample title” check box to create sample epub for a title and click on "Import" button.
5. Once the epub is created it takes to storyboard page
4. Click "Preview on Device" button.
Your epub title is created !! To view the app in your device .
Refer to "How to Preview your app in device"