When you are on the mobile site. You will first select "Mobile Functions".
Next...select "App Station".
That will bring up this page. Select the app for download.
Once downloaded, open the app and sign in.
Once signed in you will see a list of apps. Click on the "Crew Mobile App".
That will bring up this screen. Click the "Install" button.
That is all there is to it. Sign in and explore the app. Become familiar with its functions.