install a web application on my site

I'm trying to set up a web application called nGallery (a photo gallery).

I'm not at all sure how I would follow these instructions below:


Installing from Source with the .ZIP file
1.) Install the source on the target machine (be it with the installer, or the zip file).
2.) Create a virtual directory called "nGallery" that points to nGalleryWeb folder in your new directory that contains the nGallery source.
3.) Update the file permissions on the data/ directory so that the ASP.NET worker process has write permissions to this directory (NOTE: This is only necessary if using the XML datastore).
4.) Update the file permissions on the photos/ directory so that the ASP.NET worker process has write permissions to this directory. This is so the upload facilities have the correct entitlements to upload without error.
5.) Make sure your FTP account has permissions/access to the upload/ directory, if you plan to use the Bulk Add features.