The world as we know it does not exist anymore.
The ego clashes of the heads of the two superpowers of the world - Iamyo Bichovich and Iltake Adump, resulted in a Nuclear War that reduced the surface of the planet to ashes.
The remaining humans have descended into underground bunkers and will remain there until the surface has negligible radioactivity.

Also, I am super pretentious.

You were binge-watching The Simpsons, so now you are stuck on the surface.
You want to communicate with the underground humans to tell them what to do so that they survive.
They won't know 'cause they're dumb.
The only device you have found that can communicate with the bunker system is an old transmitter that can transmit a message in a language that is made of two characters and each letter followed by a space.
This devide was probably used for radio communication.