Link to tag (or category)?

Trying to get the secondary image uploaded through the plugin to link to a particular tag (or the first tag entered) associated with each particular post. So if you click on the image you get to a page that lists all posts that share the same tag. Right now the code I’m using links the image to the post (see below). Tried a few things but nothing works.

<?php if (class_exists('MultiPostThumbnails')
    			&& MultiPostThumbnails::has_post_thumbnail('post', 'secondary-image')) : ?>
<a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>" >
<?php MultiPostThumbnails::the_post_thumbnail('post', 'secondary-image'); ?>
                </a>
<?php endif; ?>

Thanks in advance for any kind help!

https://www.ads-software.com/extend/plugins/multiple-post-thumbnails/