Apps downloaded on Grundig TV?

My parents have a Grundig 43vlx600 TV. Some apps like Netflix, Facebook ect. Are already installed there. Can you also download other apps? It's a SMART TV, so it should work somehow, but unfortunately we don't find it.

Yes, basically it works. There must be a store or something similar. Maybe you have to "play over" the apps from your computer. But that seems improbable