Hello,
You can see a list of all of the parameters here: http://www.themeblvd.com/demo/jumpstart/features/shortcodes/shortcodes-display-posts/
Setting the “link” to false will hide the link all together.
[post_grid link="false"]
Or you could adjust the link’s URL like this:
[post_grid link="true" link_url="http://yoursite.com/whatever"]