sorry, I forgot to explain...
When you post, there's a button called ADD A LINK that you can click. Just paste in the address and you're done.
In the case of long URLs, like the one you posted, I copied the URL into my text editor (TextEdit on Mac Notepad on Windows) and the got rid of the extra spaces in the URL that didn't belong. I then copied the 'fixed' URL and pasted it into the ADD A LINK button. I hope this helps!
Height: 5'9'', Couch to 5k Graduate x 2 (Oct 08 & Jun 09)
SW 280 (Starting Weight - March 2008)
| current weight: 199.6