Advertisement ?
If you find our NewsPress Theme Demo you can see that there are some Advertisements. Some of our Themes has Ads options where you can add HTML, JavaScript Ads. Most of the cases your Advertiser will Supply you the Ad Code. You can simply Place the Ad Code in the Appropriate Boxes and Save Options.
Please find that we have used HTML Code where you can find the image with a Link. We have also used JavaScript Codes supplyed by adsense.google.com Ads Provider.
You can also use HTML or JavaScript Ad Code in any Text Widget in Sidebars. You can also style the Box using inline CSS.