problem with wordpress author profile page URL

How are you creating the author’s link?

If you put in your template:

<?php the_author_posts_link(); ?>

It will write the author’s name and link for the current post.

To modify the template for the author page, wordpress search for the following files in your theme’s folder (in this order):

1. author-{nicename}.php
2. author-{id}.php
3. author.php
4. archive.php
5. index.php