You may be able to listen directly from the RBdigital site:
1. On your device, go to RBdigital.
2. Login to your account.
3. Click on the Menu Icon, select Checked Out and click on the title you want to listen to.
This should take you back to the title's detail page.
4. Click on Chapters and then click on the chapter you wish to play.
Player controls will be displayed on the screen under the image of the title.