Download the FTP client "Filezilla" from the website "https://filezilla-project.org/download.php?type=client" and install the setup on your system.Once you have entered the details then you need to insert the login details to connect to your server. Following details you need to insert:-
Hostname :- ftp.YourDomainName.com
Once you have inserted the details click on "Connect" The client will be connected to your server.
You need to click on "httpdocs" as this is the document root of your website where all the
files resides. You may upload or download the files in this directory with drag and drop from one system location to the other location.