app/settings.php is only used in production, this means that is in your website not in the download .zip. Most likely the database credentials needs to be updated or permissions must be granted (that is something that you have to do in your MySQL server).
I am trying to set this up from the beginning. I followed the procedure to upload all the files in the cheveroto folder then simply go to the site and I would go through the install process but instead this is what happens from the beginning.. How else would I go about installing this to my site. Wouldn't MySQL information be setup during install (which I can't even do to begin with)?