You can now attach URLs to individual nodes. To add URLs to a node, click on that particular node
and click on 'Edit URLs' button found
on the inspector panel.
It opens up the 'Edit URLs' window.
To add an URL, enter a url on the particular field and click on 'Add'. Added urls are shown beneath 'URLs attached to node'.
To remove an added url, hover mouse to the url. It shows a delete button. Click 'delete' to remove it.
Once urls are added to a particular node, the color of url icon attached to that node changes.
To remove urls attached to a node, click on that node. Click on 'Edit URLs' button on the inspector panel. Remove all urls and close the window. You can now see the color of url icon attached to that node changes back to original.