There are two method of importing your Travel Logs (2.x.x) databases.
Launch Travel Logs (2.x.x) and go to the Settings tab. Tap on the “Version 3.0 Available now” banner and then select “Migrate existing data to Travel Logs 3.0“. Select “Open in Travel Logs“. Your data will automatically be imported into the new version of Travel Logs.
Create a backup of your database in Travel Logs (2.x.x). Copy the backup file created from iTunes file sharing and place it in the Travel Logs (3.x.x) documents directory in iTunes file sharing. Launch Travel Logs (3.x.x), go to Settings and Import.