To be able to connect to FTP and upload your site please use the credentials in the "New account information" email sent yo you up on initial sign up. Basically the FTP details are:
FTP hostname: your server IP address or your hostname if it has already propagated (please the email with subject "New Account Information")
FTP username: your control panel username
FTP password: your control panel password
Unload directory: /public_html/ or in rare occasions /
To perform the actions above you will need a FTP client we recommend filezilla http://filezilla-project.org/download.php. For those of you who have smaller sites and all this seem to complex you may still use the filemanager section inside cpanel to upload your data.