The first you see, when you have uploaded and entered the URL to your document, is the installation page.
The first thing you should do is to set the MYSQL connection information. If you don't know what to set the values to, look in your mailbox after a mail you got after you had registered a web hotel.
First of all, set the name of the gallery. This will be displayed at the start screen.
Then set the administrator username and password.
Also set a home page link url. (including http://). If you leave this blank. No link will be displayed.
The last field is for max px handle. That is how many pixels your server can handle before it says something is wrong and stops. This is important if you uses a cheap web host that limit the server power for you. What happens is that when you try to upload something larger then this. You will be told and the page won't die.
Now everything is finished and your gallery is ready to access. But before you do that. Please rename your install folder so no one else tries to change some settings