The Yellowfin mobile app will connect to an existing Yellowfin instance and does not store any data on the device, all the data/settings will come directly from the Yellowfin server itself.
If you do not currently have a Yellowfin instance you can connect to, you can connect to the Yellowfin Demo instance. A connection to the Demo instance is included with the app:
Above screenshot taken from the Android app
Connecting the app to your Yellowfin instance is actually pretty easy, given that you know the connection settings, and your device can actually get to your Yellowfin server.
Before trying to connect via the app, you should ensure that your device can reach the Yellowfin server. This can be done by opening your mobile browser and using the Yellowfin URL.
e.g. http://Davids-Macbook-Pro:8080 or http://10.10.6.23:8080
Once you have confirmed you can hit the server and login, you can set up your connection within the mobile app.