1. Log into cPanel (http://www.yourdomain/cpanel/).
2. Click on the FTP Accounts icon within the Files section of cPanel.
3. In the Add FTP Account area, add a username in the Login text box.
4. Add a secure password.
5. In the Directory text box, add public_html
6. Leave the Quota at Unlimited.
7. Finally click on the Create FTP Account button to finish the process.
So for example if the username you chose is ftpuser, and the password is 123ftpuser then your FTP connection settings will be the following:
FTP Hostname: yourdomain
FTP Username: ftpuser@yourdomain
FTP Password: 123ftpuser
Please let us know via our support ticket system if you need further assistance with this particular topic.