Aircraft types are typically added in the Options/Aircraft area of Logbook Pro PC edition. The aircraft types are then synced to your device for use in adding new flight records. If you are away from your PC you can add aircraft types in the "My Aircraft" area accessed from the "Other" section of the Home Screen. After syncing your device data back to your PC the new aircraft type will be added to the Options/Aircraft list, however, you will be prompted to complete the configuration such as specifying the category, class, etc. Tap the + on the top right to add a new aircraft type. Be sure to pay careful attention to the entry so it is all uppercase if desired, etc.