If the URL contains a "www", like www.stormboard.com, you can type the website directly on the the sticky note and Stormboard will automatically convert the text to a link (it will change to blue ink).
If it does not change into a link automatically, you may need to include 'http://'.
You can also copy and paste any URLs directly onto a sticky note.
There's no need for you to include any HTML code.
To open, simply hover over the text and click on it. A new window will open and will take you to that page.