From your Leader Tab, and in the Users section click the View Users Details button
Here you will see the total amount of users in your system, new users count, registered devices amount, and the percentage of your users that have downloaded the app so far.
Beneath that information will show a complete list view of all users signed up for your system.
For each user you will see listed in their respective row: their name, email address, account type, whether they have downloaded the app.
If they have downloaded the app, the icon in that row will be green. If not, the icon will show as red.
For each user, there are a few icons on their respective row that will provide more information as well: