Turn signals/flashers

My son has replaced my headlights and the orange bulbs on my Grand Cherokee Laredo, after replacing them we checked to make sure every bulb was working correctly and it was. So everything was secured back. And adjusted. All was good, when I was leaving I noticed when making a left turn I had no blinking signal inside the dash, so I pulled over to check and found that I had no blinkers or flashers. As a single woman what can I check to possibly fix this issue and I will need to know where as I will be doing this myself?