It is impossible for us to attempt to describe the FTP process in terms of a single software since you will find many different FTP programs for both Windows and Macintosh machines.
All programs have instructions and help files, either in the program or online.
Your PC or Mac is your local system. Below are the basic steps to use the two most popular FTP programs. Click on OK and this will bring you into your directory. If commercial or virtual, start uploading. Double click on this folder.