you mean the page with the parallax header that comes with the demo content, right? In this case, please take a look at the settings box below the editor when you edit the page -> Slideshow tab -> Custom Content, there you can change the text.
also the lower image seems to not auto size and I cant work out how the sort it out
I’m not really sure what you mean, can you send us a screenshot or the link to the page with the problem? Thank you!