To use the App on Apple iOS devices
you simply need to open the Web App link in a browser.

Web App Link

For added convenience you can bookmark it to your home screen.
For details on how to do this,
please refer to the iPhone User Guide for your device,
watch the How to Bookmark Video,
or follow the steps below:

Step 1: Open the Web App Link in Safari, and click the share icon
indicated below:

Step 2: Scroll down and select "Add to Home Screen"

Step 3: Here you can rename the icon, and click "Add"

Now you should see the icon on your home screen.
Simply click it to acess the MSC Web App from now on.