If you have already activated this free WordPress theme and wish to display the posts in Masonry or Grid style, you have to do the following:
Add a new page in the "Pages" section. For example, name it "Home".
On the newly added page, please select "Blog Listing" templates in the "Page Attributes" section, on the right and save the page.
After the page is reloaded, you will see "MariGold Settings" section below the WordPress content editor. Right there you can customize the look and feel of the page. For the blog style you can choose Grid, Masonry or Standard blog layouts.
To set this page as a home one, please go to Settings -> Reading. In the "Front page displays", please select the newly added page as a static page for the front page.