Here are some help docs about the admin center:
You just need to specify where the directory tree will be created on your domain.
In your admin center, click on "Build Static Directory", then click the link "Setup Build Directory Options".
You will find all options for building the static directory, it is very important to set the first two options correctly based
on where you want to put your directory tree on your domain, these options are:
Engine Base Directory:
URL To The Engine Base Directory:
The first option Engine Base Directory is the full absolute directory where directory tree will be generated on your domain,
from your domain settings this should be something like:
The second option "URL To The Engine Base Directory" will be the url to the folder you set in the first option, so if you
choose the folder "dir" as I set above, your url option for this will be:
I set these for you anyway but you can customize the folder as you like.