You need to give more details if you expect to get an answer.
What type of web hosting service are you using? Is it a free online host like geocities or tripod or do you have your own domain registered with a web hosting company?
Either way, you should have access to a file upload tool. If its a free site like triod, they have one already for you. Just look in main page of your accont for file upload. If you are using a web hosting company, they will more than likely be using an FTP client like WSFTPLE. Contact your host for exact detalis on how to upload the files to the webserver.
Good Luck!