1. Select Manage Sites:

2. Select your Site:

3. In the left portion of the dialog box, click on the "Servers" Bar:

4. Click the "plus" sign to add a new server:

5. Add the following information:
Server name: Choose any name you wish
Connect using: FTP over SSL/TLS (explicit encryption)

FTP Address: URL info (provided by Host 99)
User name: (provided by Host 99)
Password: (provided by Host 99)
Root Directory: See Welcome Email or Default cPanel docs
Web URL: Blank
Authentication: None(encryption only)

Click Save