To add a button between Blog Pagination in Squarespace, you can use this code to Website Tools > Code Injection > Footer.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<script>
jQuery(document).ready(function($) {
$('<div class="sqs-block-button button-block back-to"><div class="sqs-block-button-container--center"><a href="/tho" class="sqs-button-element--primary sqs-block-button-element--medium sqs-block-button-element">Back To Blog</a></div></div>').appendTo('.item-pagination[data-collection-type^="blog"]');
});
</script>
<style>
.item-pagination-link--prev, .item-pagination-link--next {
margin: 0 !important;
max-width: 33.333% !important;
}
.item-pagination-link--next {
order: 3;
}
.sqs-block-button.button-block.back-to {
order: 2 !important;
}
section#itemPagination {
justify-content: space-between;
}
</style>
Result
