The banners are constructed using CSS3 and are Text with embedded images (the demo banners).
You'll need to learn a little HTML in order to modify them to your liking.
You can revise them as the previous poster mentioned, but it's difficult to align the text you wish to ad with the classes they use.
Not an easy thing if you know nothing about coding, I suggest if your not a coder, go to one of the cheap job boards and ask for some help. You can hire someone very cheaply.