From your description it sounds like you have an invalid value in BCK > Behaviour Factory > [Name of your Behaviour] > Bundle Identifier. Since only Behaviours show up in Remote Buddy's UI, for whose Bundle Identifier the respective application could actually be found on the system, the bundle identifier being correct is a key detail.

The easiest way to create a Behaviour with all the metadata pre-filled correctly is by just dragging and dropping the application's .app bundle itself on the list view on the left at BCK > Behaviour Factory. Creating one from scratch and filling in all the information yourself is possible but it's easy to make errors here if you're not familiar with creating Behaviours.

Best regards, 
Felix Schwarz