Location of LTP6 data file
The reason the data file is difficult to find is due to Apple's decision to require developers to "sandbox" their apps. This basically isolates the apps from the OS as a security measure. Part of this decision was to hide the user's Library folder.
To find the Library folder in Finder go the "Go" menu, press the "Option" key and the Library folder will magically appear. Navigate to the "Containers" folder and within this you will see folder named com.coradine.LogtenPro6, within this folder there is a "Data" folder and this is where your logbook data is stored. There are a number of files in this folder that all contain parts of your logbook data so I would not recommend messing with them too much unless you know exactly what you are doing.
This is the path to the Data folder, replace the XXXXX with your user name.
/Users/XXXXXX/Library/Containers/com.coradine.LogTenPro6/Data
Hope that helps
Dave