Multiple images ar product page

Hello, right now I have products in my product page. And when I click on the product it opens it with description and images. But how to add multiple images to be available on the product page? I can add multiple images in admin panel to a specific product but it won't appear on the product page.

Hi,
Where do you mean? product's description or product's additional images? also what is your OpenCart version and which theme are you using?

Opencart version - 2.0.1.1
Theme I use - Default
In products description, when you click on a product list then it opens product description, and there I see only one picture.