help with advanced guestbook

How do I delete a advanced guestbook.. the person who answered my ticket said I would have to but not how to do it..
when I hit the gustbook it says there was a error... I'm lost
thanks
Katheen

 

forgot this part

I had deleted the book in Sql but it still shows up I'm lost..help.................
this is the error that comes up :

Warning: mysql_connect(): Access denied for user: 'sisters2_agbook2@localhost' (Using password: YES) in /home/sisters2/public_html/guestbook/lib/mysql.class.php on line 23
Connection Error
--------------------------------------------------------------------------------

MySQL Error : Connection Error
Error Number: 1045 Access denied for user: 'sisters2_agbook2@localhost' (Using password: YES)
Date : Sat, March 13, 2004 22:59:39
IP : 65.103.229.226
Browser : Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; Win 9x 4.90)
Referer :
PHP Version : 4.3.4
OS : Linux
Server : Apache/1.3.29 (Unix) mod_auth_passthrough/1.8 mod_log_bytes/1.2 mod_bwlimited/1.4 FrontPage/5.0.2.2634 mod_ssl/2.8.16 OpenSSL/0.9.7a PHP-CGI/0.1b
Server Name : www.incredible-sisters.com