Can't change header subtitles

I'm currently using the Matsuya template to make a photography portfolio. I'd like to change the "People" section in the header to say "Buildings" but when I click edit header it doesn't give me the option to change the subheadings? 
This is super frustrating as I spent quite a bit of time on the "Overview" page and I'd like to split my photographs into different sections. Though it isn't letting me edit "People", and I can't continue without changing it because then the subheading would be false. It does let me change the main heading, my name, on the left, but it doesn't let me change any other heading from the page header. Is there a solution?

I am having a similar problem. following.

I think i have figured it out.  Excuse me if i don't explain perfectly.  In the edit mode, click on the block above the logo/title block and edit. might be easier to see if you click on one of them and edit for there.