Have you recently registered or transferred your domain?

You sometimes need to wait 24 to 48 hours before your website will appear online. If your domain has been transferred, it could take several days for your website to appear online.

Has your web space only recently been activated?

You need to wait about 24 hours for DNS propagation.

Have you uploaded the index.htm file to your web space?

When your web space is activated, you need to upload the index.htm file to your FTP folder for your website to be displayed.

More information is given in the guide How to upload my website