Geriatric

Recently bought a super 300C with low mileage. An enthusiastic passenger pressed all the buttons in response to a question on a different topic. Result ..... Everything is now in French. The manual is no help as nothing is listed under language. Please ..... how can I be English again? I'm not a mechanic.... in fact I'm an 81yrs old lady with mobility problems (until I start driving and all else is forgotten). Can you guide me through the process of changing to English?