To fix your problem, you need either, phpMyAdmin or FTP access to your site.
phpMyAdmin method
Open your database and select wp_options table. Locate row with
option_name = ‘siteurl’. Click on Edit. In option_value field enter http://user99.com
. Click Go button to save it.
Repeat this for option_name = ‘home’. Exit phpMyAdmin and go to
http://user99.com/wp-admin/.
FTP method
Connect to your site with your favourite FTP client. Download your wp-config.php file. Edit this file by adding define( 'RELOCATE', true );
line, just before /* That's all, stop editing! */
comment line. Save and upload it back to your site. Go to http://user99.com/wp-login.php. Login as usual. Go to Dashboard ->
Settings -> General and change WordPress Address (URL) and Site
Address (URL) fields, to their correct values. Now you can remove or comment out define( 'RELOCATE', true );
line in wp-config.php.