Sanitize a username for use in URL
if ( is_user_logged_in() ) {
$current_user = wp_get_current_user(); // get current user
$sanitized_user = sanitize_title( $current_user->user_login ); // sanitaize username
echo '<a href="http://my.wellness-media.com/forums/users/' . $sanitized_user . '" title="My Account" alt="My Account">My Account</a>';
}