Gas Hotpoint oven not heating properly...

Maybe some here can help me...

I have a Hotpoint, gas range, electric oven...I think. The controls for the oven are digital, with buttons and a display. The oven is probably less than five years old. Anyway, the oven doesn't heat/pre-heat properly anymore and I think it's the thermostat but...I don't know where it's located. Can someone please tell me where it's located? Maybe if I can find it I can adjust it.

Thank you.