There are two primary ways to set price alerts in the new mobile app. These include going through to your wallet or going through to the assets page.
Navigating through your wallet
Select the wallet icon > choose the asset > Asset info > select Bell (🔔) icon top right of screen. From there you can add a new alert and create it to receive notifications when that price is hit.
Select the wallet icon.
Choose the asset.
Select Asset info.
Select the Bell icon.
Add new alert and then create the alert.