basic steps are:
- setup a DLNA server in MC via Tools > Options > Media Network > Add or Configure DLNA Servers
- if you press the input select button on the LG remote then you should see your MC DLNA server under the "Content Share" section, click this and it should offer 2 options (Photo & Video or Music), from here you can navigate through your library
- go to MC and you should see the TV as a zone (will appear as the name in the tv menu Settings > Connection > TV Name), you can right click this and "Associate with DLNA Server" if necessary (this might only be required if you have >1 DLNA server in MC)
once the last bit is setup then you can use jremote (or other MC remote) or MC to play to the TV, this is much easier to navigate vs using the TV to drill through your library (which IME is extremely slow and flaky going but is using the app in the TV so requires nothing other than the TV remote to play something)