John, if you put this:   < a href=
in front of your URL, with quotation marks around it, and then close that with another ">, then type the word or words you want to use to identify your link, then type you will make a blue clicky.

Or you could just check where it says "Make a link ("blue clicky") when you've hit "Post." It will take you through the few simple steps. :)

It will look like this: (a href="http://www.youtube.com/watch?v=a5HutpHlNA0&feature=related")Charisse/Montalban - La Bamba(/a)
except that you will use brackets like this < > instead of paragraph marks.

Charisse/Montalban - La Bamba