I checked your account and I see the .htaccess file in your htdocs directory has the lines Require all denied and Deny from all in it. Both of these lines tell the server to block all access to this folder, which can be seen as a 403 Access denied message.
Seeing how there is also a public folder in the account which I assume contains the web accessible content, I think you’ll want to replace the current .htaccess in the htdocs directory with one like this: