How to change the blog settings?

I don’t like the blog template by default in this theme. However I love how you can create a post grid block inside a page.

The problem is that I have to select the number of post appear. And I want that grid with the pagination number bottom, and read all post.

SO,

How can I modify the default blog to a grid blog or how can I to add a pagination menu in the grid post page????

The page I need help with: [log in to see the link]