If your new account with Blacknight has been setup you will have received login information in the welcome email. You can use the details provided in this email to log in to your Control Panel and upload your files through the "File Manager" or see your FTP details.
cp.blacknight.com You can see your FTP details under Websites >> domainame >> WebSite Configuration (windows) or FTP Access (linux). You can set up your email accounts under "Email" and if the domain is not synchronised please contact us.
You might need to make sure the appropriate subscription is selected in the Subscription drop down menu first if you have multiple subscriptions.