Find the FTP instructions from your hosting service. You will need to know their Host Name or Host Address. You also need to find out if they have a Remote Host Directory, many don't. The other things you will need are the Username and Password you use to log into your hosting service. One more thing you may want to do is create a folder on your computer specifically for putting your files into and enter this into the Local Directory line (it looks something like c:\myfolder).
After you've gathered all this information open your FTP program and enter the information you've gathered into it.
Page 3: Transferring Your Files