How to ask change the dynamic information in data driven pages

Hello everyone, I want to ask one question about data driven pages. I plan to create data driven pages to show each parish’s information in Louisiana. Followed is the template I am going to use. I downloaded it from ATSDR. See there is Demographic Statistics in the plate? I wish the statistics could change when the county changes. For example, when the map demonstrates county A, county A’s information would appear; while in next page, the map showed county B, and county B’s information come out. I tried to insert dynamic elements, but it failed. Because dynamic elements only include page number, date, etc. Is there anyone know how to deal with that? If you need further information, please let me know. Thank you so much.