Don't. Dreamweaver is better. None of what you're doing in either application is really programming, and yes, you do actually need that stuff that you don't know about. The only reason you don't know about it is because you don't realize that's what people use in order to do the things that you want to do.
PHP? Not yet. Support is important though. HTML and CSS are exactly what you need to learn about, however, because that's how you make webpages look the way you want them to look. There are plenty of books that can bring you up to speed with no problem. (The trick is picking one that doesn't bore you to tears in the process.) Take a look at w3c.org - I think they might have some "so you want to be a web designer" BS. At the very least you can find some explanations of the technology.
HTML/the world wide web was never meant to be edited as "raw HTML." The guy who designed HTML never imagined people would bother to learn something so ornery. HTML works on the same principles that a word processor like Microsoft Word uses to track where text belongs on the page; there's nothing about it that inherently requires a human author to dig around and do stuff by hand. (You can blame competing browser vendors not adhering to technological standards for that.)
Dreamweaver is about the best that you can get so far as drag-and-drop, WYSIWYG interfaces. You do need to learn something about the underlying technology eventually in order to understand what's going on and do your best work, but with the built-in tutorials you can get the basic layout tools down in an afternoon.
My strikes against this Web Studio program are threefold. For one, I can't find a legitimate review of it online; they're all dummy advertisement sites. Two, I've never heard of it or the publisher. Three, the vendor's website basically tells you that they're going to dumb down the internet for you, so you can be pretty sure that's what you're going to get.
What kind of website are you trying to make? For your purposes, a pre-built PHP-generated site might be the best choice for you. Basically, the PHP side of things comes pre-assembled. You supply the textual content in data files, and then you also give the PHP scripts layout templates so that they know how to pretty up the data for users. That's how the forums here work; people's posts and such are stored in big plain-text databases, and when you ask the PHP program for, say, thread #122773 - this thread - it takes the forum thread template, fills in some blanks, then takes the list of posts, puts those into the little orange-and-green bordered boxes, tacks those together one after the other with posters' names next to them, and then sends it all off to the user. Many pre-made blogs work the same way. You can get a surprising amount of flexibility with no programming whatsoever - just a little typesetting markup and you're good to go.
~Joe