The Price Alert feature will notify you whenever any of the Gemini-supported cryptocurrencies reaches a certain price. To use this feature, you’ll first need to enable notifications for the Gemini app in your phone's Settings.

How to Set a Price Alert on the Gemini App:

1. From the Market tab in the Gemini app, tap the crypto you’d like to set a Price Alert for.
2. Tap the three dots at the top right of the screen.
3. Toggle the "Market Alerts" switch on to enable market alerts for significant price movement, or Select "Create custom alert" to create a price alert for a specific price.
4. If you've selected "Create custom alert", enter the price you’d like to set an alert for.
5. When finished, tap “Create”. 

To view or disable price alerts in the app, tap on the account icon in the top right corner, select "Manage notifications" and tap "Custom price alerts". If the toggle next to the desired alert is on, it’s active. To turn off the alert, switch the toggle to “off.” To delete a custom price alert, swipe left on the alert then tap "Delete". 

How to Set a Price Alert on the Web Interface: 

1. From the Market page on the Gemini web interface, select the crypto you'd like to set a price alert for. 
2. Click on the bell icon in the top right of the price screen.
3. Toggle the "Market Alerts" switch on to enable market alerts for significant price movement, or Click "Create custom alert" to create a price alert for a specific price.
4. Enter the price you’d like to set an alert for.
5. When finished, click "Create alert". 

To view or disable price alerts on the web interface, navigate to the Portfolio page then select "Price Alerts" from the Quick links side bar. If the toggle next to the desired alert is on, then the alert is active. To turn off the alert, switch the toggle to “paused.” To delete the alert, press the three dots next to the alert and select "Delete."