Help With Changes To Site

[Canonating]

I'm hoping someone can respond. Here is the problem. A few months back I used the jigsaw puzzle to build a website for our painting company. I used a trial version of flash cs3. Is there a way I can go into my control panel or ftp to make image changes to the site? If So How Would I do That. I'm a newbie at this. If someone knows how I can do this, please explain this to me in simple terms. I don't have a flash software program that can make the changes and I'm assuming that the old versions of flash won't work to make changes as I will probably get an unexpected file error pop up.

Can Someone help?
Cheers