How to I make my post title link to a custom field

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I assume that the post title markup looks something like so:

<h1><a href="https://wordpress.stackexchange.com/questions/117332/<?php the_permalink(); ?>"><?php the_title(); ?></a></h1>

You merely need to replace <?php the_permalink(); ?> with your post custom meta value:

<?php $post_bookmark = get_post_meta( get_the_ID(), 'post_bookmark_url', true ); ?>

<h1><a href="https://wordpress.stackexchange.com/questions/117332/<?php echo $post_bookarmk; ?>"><?php the_title(); ?></a></h1>

Other caveats:

  • You’ll want to consider the context in which you use this code. If you only need it in your Blog Posts Index, then create a home.php template file, and put it there. That way, your post titles are not impacted in other contexts.
  • You’ll probably want to use some fallback in case post_bookmark_url isn’t set.