UI Components / Alert
In your Backendless App, go to the Marketplace -> User Interface tab and install the Alert componentInstall the component to the UI Container of your choice

UI Components - Alert

Alert is a component for Backendless UI Builder designer that allows you
to notify the user of some error, warning, information, or success.

The component is based on an external alert.
Customizations include alert type, icon visibility, and alert close behavior.

UI Components / Alert