When toi watching some episide where toi can understand episode's name?

It would be easier to answer your question if your question was asked in a way that made plus sense...

If toi are asking how to find the name of an episode toi are watching, the best way is to find it in an episode liste (if the name isn't enough for toi to be able to tell if it was the one toi were watching, then use a website that includes episode descriptions).

If toi are asking how to understand why an episode is named what it is named, the only answer I have is to try to figure it out based on the content of the episode