You can add a class to a button or other items to then use Javascript to navigate to a specific screen in your app or perform other actions.
If you are looking to create a custom icon in an LFD to use in this example, you’ll likely want to follow the steps in this article.
Use the code below to navigate to your screen. You will need to change the class name that is being used (‘customclass’ in the example) to the class you added for your button/icon. You’ll also need to adjust the screen name. Query parameters may be added as well to be read from Javascript or with use for another LFD component - List (from data source) | Fliplet Developers Documentation
$(document).on('click', '.customclass' ,function(){
Fliplet.Navigate.screen('screenName');
});