I have found this to be a naming issue.
That is to say your main HTML fille needs to be named index.HTML.
Some users have found that the HTML file is saved as a HTM file, so please check this. If this has happened just reopen the file in your code editor and 'Save as' HTML file.
More than likely you've not uploaded the images.
Make sure you upload all files contected with your website. The file stucture should be as follows...
Project Folder (Title it your domain name for ease)>
Assets (including images and scripts)
index.html (and other pages .html)
Make sure you're only adding the HASH code beginning 'Qm', and not the entire web address