You can find the Alpaka Presence app for your device by following this link on your smartphone:

http://app.presence.alpaka.io 

or if you are logged in to Alpaka on the web you can go to MORE in the navigation and then click on the app icon on that page.
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This article demonstrates how to clock in and out using the Presence app

The app works as your entry and exit reader for clocking in and out, but can also be configured to work as the team members' method of identifying themselves which is least prone to potential abuse.

If your reading device restarts or closes the Alpaka Presence app you might need to sign in again.