Im trying to install but im getting some errors,

It comes on the screen and looks like it works, when you type somthing then run the mouse to the the "paint it" key, in the bottom of my browser it just has wall.php then you click on the "paint it" key and you get a Bad Gateway error. Am I missing somthing.

It says to do this:

line 38: $pathto = "/path/to/your/forum";
Put the server path to your grattifi/forum directory here

I put this
$pathto = "/home/public_html/forum";

Any help would be appreciated
RON