Adding a word/sentence into header

Site URL: https://santisuk.org

Hi everyone!

I need help with one last thing (I feel like I've asked many questions on here over the course of the week). 

I would like to add simple words such as "Book One" in the header for some of the audio books we have. Is there a way to do this? I've screenshotted and circled where I'd like the word to be.

For these specific sets of pages I've removed the navigation buttons from the main navbar (I have my own below the header). 

Thanks!

Hi,
Did you solve it?!
I'm seeing a text with link there.

Please use the like button if it helps you!

Best,
Leopold