show category posts in grid

Hi,
I have installed the plug in.
I have 20 categories. Now, I want to show all posts of all categories on their respective pages.
Means if I click on Category1 on my website, it should display all posts of that category on the page. Where should I write the short code to achieve this.
Here is my website http://just4enjoy.com/

Please guide me where to write the short code to display posts in grid of any category.

Thank you

http://ww.wp.xz.cn/plugins/category-grid-view-gallery/