Na das ist ja ne tolle Anfänger Anleitung

So, um die Tabellen anzulegen brauchst du das:
-- --------------------------------------------------------
--
-- Table structure for table `#_phocaguestbook_items`
--
DROP TABLE IF EXISTS `#_phocaguestbook_items`;
CREATE TABLE `#_phocaguestbook_items` (
`id` int(11) unsigned NOT NULL auto_increment,
`catid` int(11) NOT NULL default '0',
`sid` int(11) NOT NULL default '0',
`username` varchar(100) NOT NULL default '',
`userid` int(11) NOT NULL default '0',
`email` varchar(50) NOT NULL default '',
`homesite` varchar(50) NOT NULL default '',
`ip` varchar(20) NOT NULL default '',
`title` varchar(200) NOT NULL default '',
`content` text NOT NULL default '',
`date` datetime NOT NULL default '0000-00-00 00:00:00',
`published` tinyint(1) NOT NULL default '0',
`checked_out` int(11) NOT NULL default '0',
`checked_out_time` datetime NOT NULL default '0000-00-00 00:00:00',
`ordering` int(11) NOT NULL default '0',
`params` text NOT NULL,
PRIMARY KEY (`id`),
KEY `published` (`published`)
) TYPE=MyISAM CHARACTER SET `utf8`;
-- --------------------------------------------------------
--
-- Table structure for table `#_phocaguestbook_books`
--
DROP TABLE IF EXISTS `#_phocaguestbook_books`;
CREATE TABLE `#_phocaguestbook_books` (
`id` int(11) NOT NULL auto_increment,
`parent_id` int(11) NOT NULL default 0,
`title` varchar(255) NOT NULL default '',
`name` varchar(255) NOT NULL default '',
`alias` varchar(255) NOT NULL default '',
`image` varchar(255) NOT NULL default '',
`section` varchar(50) NOT NULL default '',
`image_position` varchar(30) NOT NULL default '',
`description` text NOT NULL,
`published` tinyint(1) NOT NULL default '0',
`checked_out` int(11) unsigned NOT NULL default '0',
`checked_out_time` datetime NOT NULL default '0000-00-00 00:00:00',
`editor` varchar(50) default NULL,
`ordering` int(11) NOT NULL default '0',
`access` tinyint(3) unsigned NOT NULL default '0',
`count` int(11) NOT NULL default '0',
`params` text NOT NULL,
PRIMARY KEY (`id`),
KEY `cat_idx` (`section`,`published`,`access`),
KEY `idx_access` (`access`),
KEY `idx_checkout` (`checked_out`)
) TYPE=MyISAM CHARACTER SET `utf8`;
-- --------------------------------------------------------
Du musst natürlich alle #_ noch unbenennen in den Präfix den du vergeben hast (Standartd wäre: jos_)!
So nun machst du ein Backup! Dann gehst du nach phpmyAdmin (Beispiel) und suchst nach SQL. Dort gibst du den oben angepassten Code ein.
Der Rest steht ja in der Anleitung

MfG