From CyberWurx Customer Wiki

Adding an FTP Account

First, click on the Add on FTP Users link in the customer center.

Now you will see the ftp main menu. If you already have users added, you will see them here. Click Add User.

Now fill out the information:

• New Username - What username you want.
• Password - What password you want.
• Home Directory - This is already set to /web/sites/username so all you have to do is add: the domain and where you want them to go.
  • For example: /web/sites/demo/demomania.com/mynewuser/s/directory

Now the user will be "jailed" to that directory.

Click Save and you are done!