You can access and edit your device list here.
Category: pre-selected as 'Connected devices'
Open your LG TV Settings > General > TV Information > Model
4. Model Release Date:
Check this page to decode your LG TV serial number.
5. Operating System: webOS
All LG Smart TVs run on webOS.
6. OS version:
Open your LG TV Settings > General > TV Information > webOS TV Version
7. OS Release Date:
Check this page for your webOS version release date
- E.g if your device has 3.0.0 webOS version, you can mark the OS Release Date 1st of January 2016
This is an example how the final device adding screen would look like: