Enabling RSS alerts means you will receive Sucuri alerts in your favorite RSS feed reader.
Enable RSS alerts:
Click on the drop-down menu next to the account avatar in the upper, right hand corner of the dashboard.
Click Global Alerts and then RSS.
Tick Enable RSS to toggle the option on.
Copy the feed link to your feed reader.
If you are still not sure what do, please feel free to open a support ticket with the Sucuri team.