Editing page content

I am trying to edit part of this page but when I go to pages from the left-hand admin menu and click on the relevant page it only shows me the first section of the content ie. the beverage and food section.

It does not show me the chemicals section which is what I need to edit.

The beverages and food section seems to be cerated using a “field group” but can;t find how the cheiclas section is created aor how to edit it.

I know it’s difficult to tell without being logged in but if anyone has any suggestions, I would be really grateful.

Thanjks, Paul

The page I need help with: [log in to see the link]