How have you created your HTML code? If you've used a text editor you need an FTP program to upload the files to your webspace. The free FTP Commander is good enough: click here
Then in FTP commander you need to enter the upload details for your webspace like this: click here using your own NTL username and password of course. That’s about it, though I prefer to use a web editor that takes control of uploading and automatically overwrites files, creates folders, etc., when you update your site.