Sjorsie

Text:
Go to Appearance -> Themes -> Customize -> Static Frontpage
Here you can choose if you would like a specific page, which you can create at Pages, or that you would like the last XX amount of Blogposts.

Header:
Go to Appearance -> Header.
Explains itself

Hope that this is what you meant?

Which information do you mean? The information next to the header?

Solved:

Found it further in the style.css
It is #header-banner and manually uploaded the correct file.

@martas

Just started using Hatch myself and found in the style.css
Go to Appearance -> Editor

Somewhere in the middle you have the following:
#author-bio {
float: left;
width: 27.65957446808511%;

Just add ‘color: #fff;’ or something else you want to add there.
Did the trick for me ??