Ah, there's here and there is elsewhere online.
Here, you use PHP.
Code looks like this:
[url=http://www.cnn.com/]stuff I saw on CNN[/url]
It will come out like this: stuff I saw on CNN
Just copy what I did and change the URL and verbiage as you prefer.
Elsewhere, you use HTML code. It's not that hard.
You would type:
<a href="http://www.cnn.com">stuff I saw on CNN</a>
The <a> tags are for the URL, which has to be in parentheses. The parentheses have to be the straight kind, not the curly kind. The second tag, like in most HTML, has to have a / in it.