Hello I have 50000 yugoslavia dinr and were can I change.

Where are you at, In the US or China there are various banks that do money exchange.
Also around international travel areas there are money exchange centers

As the break up of Yugoslavia completed in 2003 you are out of luck.
This is merely a collectors piece rather than any real monetary value.

Did not know it was old money, sorry,

Guess all of my Confederate money won't spend either.