error 403: Forbidden

I successfully used SmartFTP to uplade files to my new homepage at gmx.de. It all looked well and all files were transferred. But when I want to view my homepage now, I only get the message error 403: Forbidden.

Obviously the page is not accessible to the public. The message also says, that I should correct that with my FTP program. How do I do that with SmartFTP?

April