Help Us Access Text That Needs To Be Changed

There are certain pages of our website that does not give us full access to just edit the page. It only allows for certain parts of the page. I assume this is some kind of backend plugin or theme that needs to be changed, but we have no idea how to even access it. Can someone change this text and show us how to change this for the future.

This is the page link: https://stratasfr.com/existing-sfr/

In the paragraph at the top, it mentions getting access to our Build-for-Rent and Development Project Listings, but it needs to say SFR Portfolio Listings.