You are likely to be looking at this webpage on a mobile device and therefore needs to be installed as an app. To do so you need to go to "share", and then scroll up until you see "Add to Home Screen". You will be asked if you are happy to receive notifications. If you say no to this, you won't receive notifications and to enable you will need to visit the settings menu on the device.
Tesla-Info Push manager. For the website, please visit Tesla-Info