Changing "Older/Newer Posts" image in Twenty Ten Theme

but not sure which part of the code to edit exactly

the code is right at the beginning (after the commented part) of loop.php, and right at the end;

<?php next_posts_link( __( '<span class="meta-nav">&larr;</span> Older posts', 'twentyten' ) ); ?>
<?php previous_posts_link( __( 'Newer posts <span class="meta-nav">&rarr;</span>', 'twentyten' ) ); ?>

https://codex.www.ads-software.com/Function_Reference/next_posts_link
https://codex.www.ads-software.com/Function_Reference/previous_posts_link

example:

<?php previous_posts_link('<span class="meta-nav"><img src="https://FULL_PATH_TO_IMAGE/new_arrow.jpg" alt="" /></span>'); ?>

Thanks, it works for the arrows at the top of the page but not at the bottom. I still have the standard “Older Posts” and “Newer Posts” at the footer. Where else should I make edits?

the code is right at the beginning (after the commented part) of loop.php, and right at the end;

have you edited the code section at the bottom of loop.php as well?

Oh ok! Sorry, I hadn’t realized the code was at the end as well. Thanks so much for your help.

Actually, I have one more question if you wouldn’t mind answering it!

I’d like to upload an image of a line border to place in between each post blog (as a divider). Where in the Twenty Ten theme can I insert the url of the image?