WD Backup doesn't recognize My Book Drive

I have two computers. I use WD smartware to backup my computer. I have tried using WD Backup to backup my other computer. WD Backup will only recognize Dropbox as a location to do a backup. How do I get WD Backup to find/recognize the Network Drive?

The WD My Book Live is not supported by WD Backup at the time of this post. However, you can use WD SmartWare with your unit.