If in doubt, make sure all names are lowercase before uploading. If you use the same name as an existing file, it is overwritten and replaced with your new file. There is no need to delete old files before replacing them. Again, make sure your master page is called index.html . If you are loading a lot of graphic files, you may need to be patient.
Graphics can take a long time to load.
If you want to remove the site altogether, and free up the site name, then select Shutdown a site . If you forget your password or site details, you can ask for any sites details to be resent to your original email address. Basically, we are pretty relaxed about what you put up. No porn, programs, virus's, racist or otherwise offensive material. Don't post huge files, it just slows things down for everybody.