Blog READ MORE link

Look in your portfolio (page_portfolio.php) funchtions…

Something like this:

// Custom Read More link
add_filter( 'excerpt_more', 'portfolio_read_more_link' );
add_filter( 'get_the_content_more_link', 'portfolio_read_more_link' );
add_filter( 'the_content_more_link', 'portfolio_read_more_link' );
	function portfolio_read_more_link() {
		return '<a class="button more-link" href="' . get_permalink() . '" rel="nofollow">Read More</a>';
}<!--formatted--><!--formatted-->

The LAST LINE >Read More< is the text to change. So you can make it >Read full article<

In looking at your link, you are dealing with posts, not portfolio. Same solution,
but do it in functions.php

similar to this.

//* Modify the Genesis content limit read more link
add_filter( 'get_the_content_more_link', 'epik_read_more_link' );
function epik_read_more_link() {
	return '... <p><a class="more-link" href="' . get_permalink() . '">Read More →</a></p>';
}

It is in TWO places in your theme, one in functions.php, the other in page_portfolio.php