You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
I have been clicking all over the app and website since I wasn't sure where it would appear. In one of the forums I saw someone post an image and the VIN shows where the RN and Manage link appears in the upper left. If I'm wrong I'm sure someone will clarify.