You can use the plugin_action_links_ filter for that task:
add_filter( 'plugin_action_links_' . plugin_basename(__FILE__), 'add_support_link_wpse_220726' );
function add_support_link_wpse_220726( $links ) {
$links[] = '<a href="http://example.com/support/" target="_blank">Support</a>';
return $links;
}
Note that you must also pass the plugin name (plugin_basename(__FILE__)) for it to work. That’s why take into consideration from where you will call it.
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