Open your file manager, and upload all your files to your directory, aka. your public_html folder.
I recommend you use an FTP client (aka, an ftp program) which just lets you browse your server directory as if it was a folder on your computer. Most of the time these allow you to drag/drop files onto the server.
There are plenty of FTP clients out there, but I use this one which is purely an FTP client with basically no add ons.
Code:
http://www.download.com/3000-2356-10122208.html
Just enter your FTP account details which you can get from your Cpanel etc.. and you should be on your way.
Good Luck & post some more questions if you need help ;)