You can use FTP (File Transfer Protocol) to download or upload files to your website.
You can download an FTP client from the below link.
Once downloaded the client should look like this.
You will need to enter the following information to connect to your website.
Host: Your Domain Name
Username: Your FTP Username
Password: Your FTP Password
Port: 21 for Windows based sites and 22 for Linux based sites
You can then choose Quickconnect to connect to your website.