Hello. I need to know how my visitors can download this one file from my site. I can't seem to figure out how people can download from websites. Any help is appreciated. Thanks.
If the file is in a web accessible place (i.e. somewhere inside the public_html folder) then just place a link to it, the visitors browser will automatically download it.
NOTE: This will not work if the file has a extension that is used by a website (e.g. .html, .php, .pl, .cgi, etc.) in this case you will need to either use a specially coded download script, or rename the file to something like "filename.php.txt" or put the file in a .zip archive.