If you don't have Filezilla install downloand and Install, Click here to download filezilla from this link you can choose the file appropriate for your platform.
Now you have filezilla installed, below are the steps on how to use filezilla
Step 1: Launch the FTP client (ie filezilla) on your PC
At this point you are not connected to any server.Step 2: Choose File → Site Manager to open the Site Manager.
Step 3: Click the New Site button and name your site.
You can give the new site a name to help you identify it. This site name can be anything you want it to be because it’s not part of the connection data that you add in the next steps.
The host name is the same as the FTP server information provided to you when you set up the FTP account on your web server.
In most hosting environments, FTP uses port 21, and this never changes. Just be sure to double-check your port number and enter it in the Port text field.
The Logon Type option in the Site Manager Dialogue box displays Normal.
Your computer connects to your web server. The directory of folders and files from your local computer displays on the left of the FileZilla FTP client window, and the directory of folders and files on your web server is displayed on the right.
To upload files to the server or download to your local computer simply drag and drop to the folders you want on either side. ie to upload drag files to the folders on the right side and to download drag files to the left of filezilla window.