code every third post

It depends where you want it.

homepage – usually index.php or home.php (depends which theme you are using)

Oshik

Yes it’s om the homepage, index.php but where in the code. after what do i add it ?

send a link and i will tell you

usually its in the content section

here is my index file ??

https://pastebin.com/jTNS6x5e

You have to add:
$counter = 1;
before line 20 (<?php while(have_posts()) : the_post(); ?>)

and add this:
if( $counter === 3 ) { ?>
<div class=”third-div-in-loop”>content</div>
<?php }
$counter++;

before line 55 (<?php endwhile; ?>)

thanks a bunch! ??