I know how to use:  bold, italic, and mark, but I am not so sure how to use the 'tt', 'url', 'img', 'vid' buttons.

I guess I know how to use teletype, but what is it used for again anyway...code or something?

teletype is for code?

This is an attempt at using the url:  [url='http://techresearch.intel.com/ProjectDetails.aspx?Id=1']some url[/url].

What I did was:
1.  highlight "some url".
2.  enter in single quotes the following url as, 'http://techresearch.intel.com/ProjectDetails.aspx?Id=1', after "[url=" and before "]".
3.  then says the "some url".
4.  then says "[/url]".

That is like the html right?  Anyway, at least in preview this is coming up as having the 'http://techresearch.intel.com/ProjectDetails.aspx?Id=1' highlighted as the blue link, but the "some url" is as text.

Examples?