header and links to posts page

Hi,

I am using parallax theme from themify for my website. I have a static home page with a ‘posts’ module on it.
https://secretfieldlavender.com/#blog
I have several problems. The default for the posts displayed here has a ‘more’ button that links to a single post page (ideally that would say ‘read more’ and be centred)
Is it possible to make these link to my posts index page, where all posts are displayed?
Also I can’t seem to edit the appearance of the page I’ve selected as my posts page.
https://secretfieldlavender.com/blog/
I want to exclude the header and would like to put some text at the top but when I edit the page in the themify builder they don’t show up.

Does that make sense?

Thanks.