How do I change featured photos on FB business page

Can ANYONE tell me how I can choose my own featured photos on my FB business page? Because I have been searching for almost 2 hours and all I have been able to do is find how for a personal timeline which is SO easy to do, yet it seems impossible on a business page. Mine is showing photos that are at least 2 years out of date. It won't even choose recent photos and it's driving me crazy. The photos showing are totally irrelevant today. Any help would be hugely appreciated