Installation Problem

[supernova04]

YaBB SE Version: 1.5.5
PHP Version: 4.2.3
MySQL Version: 3.23.x
Server Platform: Unix, Linux, or BSD

Problem Description:
After the screen where I had to enter MySql server name and password, etc, I got the following error:

Warning: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) in /homepages/46/d30488382/htdocs/242/YaBBSE/install.php on line 357

Warning: MySQL Connection Failed: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) in /homepages/46/d30488382/htdocs/242/YaBBSE/install.php on line 357

Cannot connect to database server with given data!

Please check the information you provided, and then try again.

Can anyone help with what this means i've done wrong?

[supernova04]

i think i have to create a mysql databse. but i don't know how to do this...