Hello Astrid,
Hopefully doing well!
Appearance > Header not the problem there i can upload an image but the h1 text goes away.
Prana supports (Image Header) without title / tagline. You may use any good image editing software like Photoshop to design the header of your blog.
featured img I undrestand that each page can have a featured img. but this does not work. no img show up
Go to Appearance > Prana Options > Post Settings
You may select “Post Featured Image” settings i.e. Use Featured Image Automatically or any other according to your blogging style.
I have inst. v 1.2 of prana then upgraded to prana pro and there is an update for prana 1.3 but when I try to install gives error msg
Following thread will e helpful to you,
http://designorbital.com/community/threads/how-to-upgrade-a-wordpress-theme.25/
Thanks