You will receive an SMS as soon as you have been invited as a Supporter.
Tap on the link in the text message. A prompt would pop up.
Tap on Open link
You will receive a warning re: following unknown links. No worries about that since Lumin is absolutely safe. Just tap on OK.
You will be brought to a page where you can download the App. Tap on the Google Play button.
If you get a prompt asking you what to use to open this link, choose Play Store
You will be brought to the Lumin download page in Google Play. Tap on Install to start downloading.
Once the download and installation are complete, you can tap the Open button in the Play Store listing, or tap the icon from the notification tray to open the Lumin Supporters app.
Should you ever need to download the app again, you can tap on this link and download it from the Google Play Store.