Please be more specific. What error message are you getting? What URL are you trying to log in to?
Also, after uploading my website yesterday I got a 403 error while trying to access it.
Your site looks fairly empty, but I'm guessing that is because you removed the files causing issues.
Check that file permissions are set correctly, and not set to Permission 777.
Files should be set to 0
644 and folders/directories should be set to 0
775.
You can set permissions from within your cPanel & FTP.