Hi,
Please open to edit single.php file.
Find this code:-
<div class="related-wrap">
Replace with this code:-
<ul class="post-pagination-wrap curved-bar-styling clearfix">
<li class="prev"><?php next_post_link('%link', __('<i class="ss-navigateleft"></i> <span class="nav-text">%title</span>', 'swiftframework'), $same_category_navigation); ?></li>
<li class="next"><?php previous_post_link('%link', __('<span class="nav-text">%title</span><i class="ss-navigateright"></i>', 'swiftframework'), $same_category_navigation); ?></li>
</ul>
<div class="related-wrap">
.