website heading

Hello
My website consultant is no longer available and I am trying to find mmy way around WordPress. I am succeeding for the most part but need to change the heading (i.e. currently Jervis Marine Insurance Experts) on [Moderated: Redundant link redacted.] to another name. The change needs to be made for each page.
Can you offer any guidance on this please?

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