If you uploaded your files to your web site, via the File Manager, your pages are already published. Do Not go to the Website Wizard and use the "publish" option. If you do, the Website Wizard could overwrite your existing files.
The simple act of uploading your pages, is publishing. You should now be able to use the editors in the File Manager. Every time you make a change, and then save the changes, your file is immediately available to the internet.