Changing Names of Tree Items
Many items on the Object Tree have setting windows that pop up when you double-click. However some items do not (e.g. a Subassembly, Custom Element, Keyword, Embedded Script, ARN), and therefore it can be a little confusing how to change the name of these items.
You can either highlight the item and the left-click again to edit the name, or highlight the item and press F2 on the keyboard.