A commenter has asked how to post a link. Well, let's say I wanted to link to a popular news and politics blog such as Hot Air. When I put the link in my post, instead of the web address, you'll see a highlighted word or sentence, for example: Check this out. Click on it and you're taken to the web site I linked to. What this actually looks like in code is:
<"a href=http://hotair.com/>Check this out<"/a>
Note: the quotation marks are just so that you can see the code for the purposes of this example; you don't actually type them in when you're linking.
All you have to do is copy the web address and plug it into the formula (plus use a word or sentence that appears in lieu of the actual url, such as "Check this out", or "Look at this idiot", etc).