If you have information on an object such as a sticky note and you want to be able to link to a relevant external page, you can add a hyperlink to the object.
Copy the URL of the external page
Select the object you want to hyperlink
Choose 'Edit link' from the context menu
Use CTRL+V (or command+v on a Mac) to paste your link into the text field
Hit 'Enter' to save the link
Now you're all set to add hyperlinks and continue creating cool stuff.