You can view your website and use ftp before DNS propagation changes have taken effect.
Preview Your Website
1. Login to your hosting control panel from your client area. Client Area > Services > Click on your service > Open Control Panel.
2. Inside your control panel find "Preview".
Using Server IP For FTP
You can use the server IP for FTP access rather then your domain. To find your server IP:
1. Login to your hosting control panel
2. Under your domain name on the main page the IP will be listed.
Use the listed IP to connect with FTP.