Addidng graphics to page?

[eeeee]

On Desktop there is quite a band of white space on Left and Right of screen
I know the basics of javascript and HTML, and once asked about how to add a canvas to the page, but I didnt get that working.
I see theres a setting where you can add custom HTML etc
How can I add boxes at the edges to put pictures in etc?
I also wanted to add a Description to the front page on what the forum is about, how precisely can I do that?
Thanks

[julian]

add a Description to the front page on what the forum is about, how precisely can I do that?

You'd be looking at a header widget for this. ACP > Extend > Widgets