Image add/change and Header change

Hello
I want to know how I can add image to the top of the page where it says store and is white.
https://goldandinvestment.org/?page_id=591

Other pages have images that where pre loaded in the site and have the latin words with it as well.

Also despite bolding and using header 2 on the Orange text.(above the coins) if comes out all faded looking. How can I change that?

The theme is Advanix.

Thanks in advanced.