The profile field for authors in WordPress strips all the HTML tags so can you cannot include rich content with hyperlinks, pictures or even basic HTML formatting in your profile pages. David has a simple solution to bypass this limitation and show HTML content in WordPress Profile descriptions:
To do this, open up /wp-includes/registration.php in a text editor. Then, find the following code:
$description = apply_filters('pre_user_description', $description);
Comment it out by putting two slashes in front of it, making it:
//$description = apply_filters('pre_user_description', $description);