Selecting backup destination

When I plug in the duo usb drive, it launches the app but when I go to start a back up it brings up the  BACKUP window with SELECT DESTINATION and RESTORE.   When I tap Select Destination it doesn’t do anything.  I cannot get passed this to even start the backup.   Memory Zone sees the Internal Memory AND the Dual USB drive but won’t let me select a destination for the back up.   

It does the same thing if I try to schedule a backup to run.    Since its doing this, it makes the app basically useless to me.  How do I get it to allow me to select the destination for the backup?   It won’t let me select anything.

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