I have a HTML source mode on a web-page I have, but how do I add colour or a background?

I have already got some codes but when I enter them they appear as they are and do not convert to a colour. How do I make sure I have the right thing?
Nick T it changes the HTML pink but not the page, when changed back to normal
I just need a manual button, I am editing a Wiki and can't use dreamwaver
Where in the code should I add it?

Can I just add it to the end of the code??

Thanks guys
Jim thanks mate. I am a little closer but it has added one line of dark blue with the words 'blah' in orange How do I get the whole thing to be in colour??
 
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