To change the Alert Tone of the Card, simply 

1. Ensure the card is connected

2. Visit the page below on your app by clicking on the a card you want to manage the tone for

3. Click "Shield Settings"

4. You will see a screen similar to the picture below

5. On this screen, you can select the different "Alert Tones". These are the different tones for the card

6. You can also select a bunch of different Ringtones for your phone - for when the Phone Alert is activated say when you use the find my phone feature. To do so, press the Ringtone setting to see options.

7. Scroll up and press back arrow to save.