Pointing to directory that does not seem to exist

The link pasted above takes me directly to your style sheet. The style.css definitely exists, you must be going through a wrong path to get there. Perhaps there is another folder which was uploaded in an incorrect spot which shares the same name as the real folder and it is confusing you. On most linux servers you will be going to public_html and within there looking for a folder titled wp-content then themes… etc. If your host uses cPanel and you have an addon domain, it may be in a folder within the public_html, likely titled manhattaninfidel or something similar.