Mobile Optimization

My site looks not so good on mobile. The images are small and difficult to see. If they are placed next to words, the words and image are hard to read. But the format looks great on desktop. See this page on a phone for example:

How can I make certain sections visible on desktop and not mobile and vice versa?

Here is my login info:

Username: Jaclyn
Password: Pinecone4!

Hi there

The problem here is not in the theme theme but in the design method of the page and page builder plugin visual composer you use, please get in touch with them for assistance