You can share your app from the home screen of you app.
You can also share your app from within the admin console.
  1. Click on the Admin (button near the top left corner of the app)
  2. Click on "Share your app" and choose from one of the available methods
Furthermore, your app is sharable from within the "Extra Tab".

If you are using a marketing tool such as Mailchimp, you can also embed your personal install link and email blast your personal install link to clients.