How to change old facebook business profile to new?

My business's facebook profile was set up in 2008 and still displays 'family and relationships' 'places I've lived' and all the classic facebook profile sections. I want to update it to a business profile but can't find anyway of doing it. Other forums have suggested 'change it in the ''basic info'' but this isn't there for my page. I also want to add a call to action button but it says error when I try despite it being an option. I'm a social media manager and even this one has stumped me. Please help!