Location of stop light switch in my 2000 hyundai elantra

My brake lights don,t illuminate when I step on the brake pedal. I checked the bulbs, they’re fine. I was told that it could be the stop light switch. Where is it located and what does it look like? If I check the switch and it’s fine, what else should I suspect?

It will be mounted on the brake pedal bracket on the firewall.

Are all other electrical accessories functioning?

Have you checked the Fuse. That should be the FIRST thing you check.