Help needed with php navigation

Help!
I have worked on my pagination and now my single post pagination is off. Please see it here:
https://www.minademas.com/2008/01/02/introduciendo-al-mundo-womee/

As you can see, I can now see 2 styles of pagination, the article ones and below that the new navigation by pages.

My code on navigation.php is:

<?php if (is_single()) : ?>

<div class=”navigation”>

<span class=”previous”><?php previous_post_link(‘← %link’) ?></span>

<span class=”next”><?php next_post_link(‘%link →’) ?></span>

</div>

<div class=”clear whitespace”></div>

<?php endif; ?>

<?php if(class_exists(‘wp_pagination_plugin’)){
$p = new wp_pagination_plugin;
$p->show();
$p->nextLabel(”); // removing text ‘next’
$p->prevLabel(”); // removing text ‘previous’
$p->nextIcon(‘►’); // changing the icon ‘next’
$p->prevIcon(‘◄’); // changing the previous ‘icon’
}

——-
How can I fix it so on the Single post I can only see the article navigation and NOT the pagination style? I know it has something to do with the php if, but I dont know how to put it correctly. Tks!