Well i don't really know if someone has posted something like that but i had some problems with my MySQL (when using localhost as i had put a password to my root and after that none database was able to be installed) and i managed to fix it.
If you had put password in your MySQL in this window and after that you cant change it, well there are somethings you can maybe do.
If you want to install a database like thathttp:// and you cant put it in your l2djb database then do this :right click in the database_installer and click in edit and find this: and wherever is the line root down from it write your own password of your mysql.
Then to create your server follow these that say the other guys here in our Forum.
If you have a problem again with your password for starting your server from StartGameServer
then enter the folder gameserver/config and find the file server.properties. Right click then edit and after that find this line : and put your password.Save it and its ok.
then you may have the same problem in starting StartLoginServer .So enter the folder login\config and right click and edit the loginserver.properties file. Find the line and put your password again.
PS The folders gameserver and login you will find them by downloading others Packs like A-Styles and etc. To make a server follow someone's else pack.I just want to help those who have a problem with mysql.
If you have any question just say it .IF THE SAME THING WAS AGAIN POSTED BY SOMEONE ELSE PLEASE TELL ME AND LOCK THE TOPICK.