FTP error occurred - cannot put index.html. Access denied. The file may not exist, or there could be a permission problem.

What version of Dreamweaver are you using?

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1) If you CAN see the files when you go into dual-pane view, then the problem may be a CHMOD permissions problem. Right-click on an html file and see if "Set Permissions" appears in the context menu. If so, set the permissions to 644. If not, go to the macromedia exhange here:
http://www.macromedia.com/cfusion/exchange/index.cfm#view=sn106&viewName=Exchange%20Search%20Details&loc=en_us&authorid=13654190&page=0&scrollPos=0&subcatid=0&snid=sn106&itemnumber=0&extid=1013102&catid=0
And install the "Set Permissions" extension. (This is the version for MX2004--if you have one earlier, run a quick search, because there is also one for earlier versions of Dreamweaver.)
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2) If you can NOT see any files from dual-pane view (which is what seemed to be the case from what you said):

In your Site Definition for this site (reached from the main menu by going to Site > Manage Sites, or by picking "Manage Sites" from the dropdown menu in the "Files" palette -- and then clicking the "Edit" button for the site in question), under "Remote Info," there is probably some inaccurate information entered. Make sure that it is correctly configured. If the website is being hosted by a web host, you will need to pick "FTP" for Access, and try either "frontieraids.com" or "ftp.frontieraids.com" as the FTP host. The Login and Password should be the root-level login and password that you were given when you set up the domain with your host; generally it's the same one you use to log in to whatever online control panel you were given.

If you enter all of this and hit the "Test" button and it SUCCESSFULLY connects to the server, then the problem is probably that the "Host directory" is set incorrectly. Many web hosts put the HTML files for your site in a subdirectory such as "/www/" or "/public_html/" and if you don't enter this Dreamweaver will be trying to connect to the wrong folder. How do you know what to enter for this value? Empty the field completely and then hit the "Connect" button in dual-pane FTP view, and see what the subfolders are on the remote site. Open them up and check out their contents--one should contain your HTML files. If that folder is, for example, "/www/html/" then enter THAT as the "Host directory" and now the remote and local sites should be on the same page, so to speak.

So the question is, when you hit the "Test" button, does it connect successfully? If NOT then the problem is just that your login is wrong. Ask your ISP if you can't figure out the correct login name and password to connect to your FTP site. Try using the login information for your primary frontieraids.com email account. Keep in mind that with some hosts you will NOT use "frontieraids.com" as the "FTP host" but actually log in to THEIR ftp server with a username and password they give you.

Tell me what happens with that Test button and I can help more.