This description is coming from the post excerpt having title Multipurpose Theme for Business. You can also add content directly in the post editor and the code will automatically trim 25 words out of it and display as a description. But if you do use post excerpt than you can add different information in this slide than the post page. Just click read more and you will different content in the post page..
Add more than 25 words as excerpt. This post excerpt, does not have 25 words, so no read more button is shown.