Small Business Theme shows the featured images as slide show. Free Version can show the latest 02 posts images and Pro Version can show selected posts images up to 20 or more.
Featured images can be attached to your post or page using the Write Post or Write Page panel. There is a section on the right bottom side where you can set a featured image. Walk through the following steps to attach the image to the post or page.
If you want fully covered image the image should be 930px X 354px or higher ratio. Please crop the image appropriately using an image editor first before uploading.
Click the set featured image link
Upload a file from your computer, or use an image from the media library
Wait for the image to upload, and the following screen to appear. Select the Image and Click the “Set Featured Image” link
The featured image will now show on the Write Post or Page panel
For Pro Versions Please select the Post Meta as follows if the selected post's featured image will be wanted to show in the sliders.
The difference of Free and Pro Versions can be found Here.