1990 Volkswagen Passat My blinkers aren't working

I click my indicator stick down so I can tell other people what I am planning on doing, but when I do it doesn't tick or show anywhere outside-whether I am taking a left or right- that I want to turn, there is only a little green light that just stays there as long as the indicator stick is indicating which way I'm turning. It used to flash when I was turning but it just stopped working. Where in the vehicle would I find the cords to connect something or just to look at it, and what would I do to fix it?