@apaolo – that’s a completely different issue. Please post your own help topic and we can help you out there.
@terrybull – WordPress “pages” are not HTML pages you can open up in an editor. They are, quite literally, dynamic views of content inside your MySQL database that are parsed and rendered into HTML via PHP. A theme is basically PHP files that WordPress uses to decide how to present this data. See the theme template hierarchy to see a bit of what your theme is doing. A request comes in, your server passes it off to WordPress, WordPress parses the request (imaginary dialogue: “the browser wants to see <url> – which maps to this data in this row of the database, [grabs data], okay and this data is a ‘single-page’ so that means we use these parts of the template, [grabs the template files needed], and this part of the data goes here and this one goes here, and this one goes there, okay and let’s render this and send it back as HTML). And that gets rendered as HTML which is sent back to the browser.
So to get back at your question – you can’t edit the page ‘content’ inside your text editor because its composed of two parts – the database data (can’t edit that outside of WordPress or the database) and the PHP theme files that render that data into HTML (can edit this but it has no ‘content’). Now if you would like to change how the data gets presented through your theme(s), I would suggest taking a look at the wonderful (and well commented) _s starter theme. You can look through the code and get an idea of how WordPress renders your data.
Hope this helps.